SS

Supplementary Services

Services →
Introduced in Rel-4 Also in: Testing

SS is a set of advanced telephony features, such as Call Forwarding and Call Waiting, that enhance basic call capabilities in circuit-switched networks and IMS to provide a richer user experience.

Category
Services
Introduced
Rel-4
Where
Management
Also touches
1 segments
Specifications
177 specs
SS Description Purpose Related Classification Specifications

Description

Supplementary Services (SS) represent a comprehensive portfolio of value-added telephony features defined in 3GPP standards that operate in conjunction with the basic telecommunication service, which is primarily the establishment and maintenance of a two-party voice call. They are a cornerstone of traditional circuit-switched (CS) mobile networks like GSM and UMTS, and their principles and many specific services have been carried forward into the IP Multimedia Subsystem (IMS) for VoLTE and VoNR. SS modify, supplement, or restrict the basic call in some way to provide users with greater control, privacy, and functionality.

Architecturally, in classic GSM/UMTS CS networks, Supplementary Services are managed by the Home Location Register (HLR) and executed by the Mobile Switching Center (MSC) or Visitor Location Register (VLR). The HLR stores the subscriber's SS subscription data, including which services are allowed and their specific parameters (e.g., the forward-to number for Call Forwarding Unconditional). When a subscriber registers with a network, this data is transmitted to the VLR serving that subscriber. The MSC/VLR then applies the logic for these services during call setup and in-call phases. Signaling for SS activation, deactivation, and interrogation uses the Mobile Application Part (MAP) protocol between HLR and VLR, and DTMF tones or unstructured Supplementary Service Data (USSD) codes are often used for subscriber interaction.

In the IMS domain for VoLTE/VoNR, Supplementary Services are implemented using SIP (Session Initiation Protocol) methods and event packages, aligning with the IP-based nature of IMS. The service logic often resides in an Application Server (AS) within the IMS core. For example, a Call Forwarding service in IMS would be handled by a SIP AS that intercepts INVITE requests, checks the subscriber's forwarding rules, and potentially redirects the call. The traditional CS-style SS are mapped to equivalent IMS communication services, ensuring feature parity and smooth migration for subscribers. The management of SS settings in IMS can be done via Ut interface (using XCAP protocol) allowing a user to configure services via a web portal.

The operation of a specific Supplementary Service involves a well-defined state model and procedures. Taking Call Waiting as an example: when a subscriber (User B) is engaged in an active call and a new incoming call arrives, the MSC (or IMS AS) determines that Call Waiting is active for User B. Instead of rejecting the new call with a busy signal, the MSC/AS applies call waiting tone to the existing connection and sends a notification (e.g., a SIP re-INVITE with alert-info header) to User B's UE. The UE then provides an indication to the user, who can choose to place the first call on hold and answer the second one, invoking the Call Hold supplementary service. This demonstrates how multiple SS can interact to create a complex user experience. Another critical category is Call Barring, which includes services like Barring of All Outgoing Calls (BAOC) or Barring of Incoming Calls When Roaming (BIC-Roam), which are crucial for security and cost control, especially in roaming scenarios.

Purpose & Motivation

Supplementary Services were created to transform the mobile phone from a simple wireless voice pipe into a sophisticated personal communications tool, matching and eventually surpassing the feature set of the fixed-line telephone network (PSTN/ISDN). The basic telecommunication service only provides connection establishment and voice transmission. SS add the intelligence and user control necessary for practical daily use, such as managing multiple calls, protecting privacy, and customizing call handling based on time or caller identity.

Historically, the development of SS in GSM (starting from Phase 1 and greatly expanded in Phase 2) was driven by the need for standardization across different operators and countries to enable seamless roaming and interoperability. Without standardized SS, a feature like Call Forwarding might work in a subscriber's home network but fail when roaming, leading to a fragmented user experience. The 3GPP specifications provided a common set of features, protocols, and interfaces, ensuring that a service like Calling Line Identification Presentation (CLIP) would work consistently regardless of the visited network.

Furthermore, SS became a significant source of revenue and differentiation for operators. They could offer tiered service packages, charging extra for advanced features like multi-party conferencing or explicit call transfer. They also provided essential tools for subscribers: Call Barring services allowed parents to control children's phone usage or businesses to manage employee calling privileges. Call Forwarding enabled "follow-me" functionality. As networks evolved to IMS and VoIP, it was imperative to preserve this rich set of features to ensure user acceptance of new technology. Therefore, a major design goal for IMS was to support equivalent or enhanced Supplementary Services, solving the problem of feature regression when migrating from CS voice to VoLTE/VoNR, thereby protecting both the user experience and the operator's service revenue.

Classification

Part ofIMS

Release Timeline

Evolution Across Releases

Rel-4 Initial

Introduced a comprehensive set of Supplementary Services for the GSM/UMTS circuit-switched domain as part of the 3GPP standardization. Defined the core architecture with HLR storing subscription data and MSC/VLR executing services. Included fundamental services like Call Forwarding, Call Barring, Call Waiting/Hold, Calling Line Identification, and Multi-Party Communication.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-5

Began the work on mapping and supporting Supplementary Services in the new IP Multimedia Subsystem (IMS) architecture. Defined initial IMS service requirements and the use of SIP for implementing SS features, laying the groundwork for VoLTE.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-6

Enhanced IMS-based Supplementary Services, specifying more detailed SIP procedures for services like Call Hold, Call Waiting, and Conferencing. Introduced the Ut interface using XCAP protocol for user-managed service configuration (e.g., setting call forwarding rules via a web interface).

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-7

Continued refinement of IMS Supplementary Services, including work on service interworking between CS and IMS domains (e.g., for subscribers roaming between networks). Improved support for number portability interactions with SS.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-8

Solidified IMS-based Supplementary Services as a core part of the VoLTE profile. Defined the IMS Communication Service Identifier (ICSI) and IMS Application Reference Identifier (IARI) to identify specific SS applications. Ensured alignment with EPS/SAE architecture.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-9

Enhanced support for emergency calls in conjunction with Supplementary Services (e.g., ensuring barring services do not apply to emergency calls). Further defined service continuity aspects for SS during SRVCC handovers.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-10

Introduced Rich Communication Services (RCS) which builds upon IMS and incorporates enhanced messaging and call features that extend traditional Supplementary Services (e.g., enriched call with content sharing).

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-11

Focused on service centralization and continuity, ensuring Supplementary Services work seamlessly across access technologies (CS, LTE, WiFi) via the IMS SCC architecture. Refined the management and provisioning interfaces.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-12

Enhanced support for Supplementary Services in machine-type communication (MTC) and for enterprise communications. Worked on optimizations for battery-efficient signaling related to SS management.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-13

Further integration of Supplementary Services with VoLTE and ViLTE (Video over LTE) profiles. Specified detailed test cases and performance requirements for IMS-based SS to ensure interoperability.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-14

Extended Supplementary Services concepts to support Mission Critical Push-to-Talk (MCPTT) and other critical communications services over LTE, defining group call and dynamic group management features.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-15

Defined the support and evolution of Supplementary Services for the 5G System and VoNR. Ensured that IMS-based SS work over the 5G Core network, including interactions with network slicing for service-specific slices.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-16

Enhanced 5G IMS Supplementary Services with a focus on integration with new 5G capabilities like network exposure. Worked on advanced calling services for vertical industries as part of 5G phase 2.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-17

Continued evolution for 5G-Advanced, including Supplementary Services for Non-Public Networks (NPN) and industrial IoT scenarios. Explored AI/ML-based enhancements for intelligent call handling features.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-18

Ongoing work within 5G-Advanced on further enriching communication services, potentially integrating traditional SS with immersive media calls and extended reality (XR) applications.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-19

Maintenance and potential introduction of new service features for the evolving 5G and beyond 5G communication landscape, ensuring Supplementary Services remain relevant and powerful.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402
Rel-20

Future-looking evolution, likely focusing on the integration of communication services with AI-driven networks, advanced privacy features, and support for novel use cases in the 6G exploration timeframe.

TS 21.905TS 23.110TS 24.167TS 24.424TS 24.623TS 25.171TS 25.172TS 25.173TS 25.221TS 25.302TS 26.130TS 26.131TS 26.132TS 26.253TS 26.260TS 28.309TS 28.518TS 28.541TS 28.606TS 28.616TS 28.622TS 28.623TS 28.626TS 28.629TS 28.653TS 28.656TS 28.659TS 28.662TS 28.663TS 28.669TS 28.673TS 28.676TS 28.706TS 28.709TS 28.733TS 28.736TS 29.007TS 29.332TS 29.412TS 29.424TS 31.111TS 31.121TS 31.829TS 32.101TS 32.102TS 32.103TS 32.111TS 32.150TS 32.153TS 32.154TS 32.300TS 32.302TS 32.303TS 32.306TS 32.307TS 32.311TS 32.312TS 32.313TS 32.316TS 32.317TS 32.323TS 32.326TS 32.343TS 32.346TS 32.347TS 32.353TS 32.356TS 32.363TS 32.366TS 32.367TS 32.373TS 32.376TS 32.393TS 32.396TS 32.401TS 32.413TS 32.416TS 32.417TS 32.443TS 32.446TS 32.506TS 32.507TS 32.523TS 32.526TS 32.602TS 32.603TS 32.606TS 32.607TS 32.613TS 32.616TS 32.617TS 32.622TS 32.623TS 32.626TS 32.643TS 32.646TS 32.652TS 32.653TS 32.656TS 32.662TS 32.663TS 32.666TS 32.667TS 32.673TS 32.676TS 32.713TS 32.716TS 32.722TS 32.723TS 32.726TS 32.733TS 32.736TS 32.743TS 32.746TS 32.753TS 32.756TS 32.763TS 32.766TS 32.773TS 32.776TS 32.783TS 32.786TS 32.792TS 32.796TS 32.808TS 32.818TS 32.824TS 32.832TS 32.866TS 32.880TS 34.109TS 34.114TS 34.229TS 36.171TS 36.509TS 36.579TS 37.171TS 37.355TS 37.544TS 37.571TS 37.579TS 37.901TS 37.910TS 37.911TS 37.976TS 37.977TS 38.101TS 38.104TS 38.151TS 38.161TS 38.171TS 38.212TS 38.214TS 38.300TS 38.321TS 38.508TS 38.509TS 38.521TS 38.523TS 38.551TS 38.561TS 38.741TS 38.761TS 38.762TS 38.810TS 38.817TS 38.834TS 38.852TS 38.853TS 38.863TS 38.870TS 38.873TS 38.884TS 41.033TS 43.901TS 51.010TS 52.402

Explore further

Broader topics and technologies where SS plays a role.

Topics
OAM (Operations & Maintenance)SON (Self-Organizing Networks)IMS & Voice (VoLTE, VoNR)Roaming & InterconnectPrivacy (SUPI, SUCI)LTE / LTE-Advanced
Technologies
LTE

Defining Specifications

3GPP specifications that define or reference SS, with the latest known release. Sourced from the 3GPP document catalog — see methodology.

SpecificationTitleRelease
TR 21.905 vj00 3GPP Technical Terms and Definitions Rel-19
TS 23.110 vj00 Access Stratum Services Specification Rel-19
TS 24.167 vj00 3GPP IMS Management Object Specification Rel-19
TS 24.424 vj00 XCAP over Ut for Supplementary Services MO Rel-19
TS 24.623 vj00 XCAP Protocol for Supplementary Services Rel-19
TS 25.171 vj00 A-GPS Minimum Performance Requirements for UTRA FDD UE Rel-19
TS 25.172 vj00 A-GANSS UE Minimum Performance Requirements (FDD) Rel-19
TS 25.173 vj00 A-GANSS Performance Requirements (TDD) Rel-19
TS 25.221 vj00 UTRA TDD Physical Layer Specification Rel-19
TS 25.302 vj00 UTRA Physical Layer Services Rel-19
TS 26.130 vj00 RTP Payload Format Testing for 3GPP Codecs Rel-19
TS 26.131 vj00 Terminal Acoustic Performance Requirements Rel-19
TS 26.132 vj00 Terminal Acoustic Test Methods Rel-19
TS 26.253 vj00 IVAS Codec Algorithmic Description Rel-19
TS 26.260 vj00 Immersive Audio Objective Test Methods Rel-19
TS 28.309 vj00 QoE Measurement Collection IRP Solution Set Rel-19
TS 28.518 vj00 Fault Management for Virtualized Networks Stage 3 Rel-19
TS 28.541 vk00 5G Network Resource Model (NRM) Stage 2/3 Rel-20
TS 28.606 vc10 CN and non-3GPP interworking NRM IRP Solution Sets Rel-12
TS 28.616 vj00 EPC and non-3GPP access NRM IRP SS definitions Rel-19
TS 28.622 vk20 Telecommunication Management; Generic NRM Information Service Rel-20
TS 28.623 vk00 Generic NRM IRP Solution Set Definitions Rel-20
TS 28.626 vj00 State Management Data Definition IRP Solution Set Rel-19
TS 28.629 vj00 SON Policy NRM IRP Solution Set Definitions Rel-19
TS 28.653 vj00 UTRAN NRM IRP Solution Set Definition Rel-19
TS 28.656 vj00 GERAN NRM IRP Solution Set Definitions Rel-19
TS 28.659 vj00 E-UTRAN NRM IRP Solution Set Definitions Rel-19
TS 28.662 vj10 Generic RAN Network Resource Model (NRM) IRP IS Rel-19
TS 28.663 vj00 Generic RAN NRM IRP Solution Set Definitions Rel-19
TS 28.669 vj00 RPTA IRP Solution Set (SS) Rel-19
TS 28.673 vj00 HNS NRM IRP Solution Set Definitions Rel-19
TS 28.676 vj00 HeNS NRM IRP Solution Set Definitions Rel-19
TS 28.706 vj00 IMS NRM IRP Solution Set definitions Rel-19
TS 28.709 vj00 EPC NRM IRP Solution Set Definitions Rel-19
TS 28.733 vj00 TN NRM IRP Solution Set Definitions Rel-19
TS 28.736 vj00 STN Interface NRM IRP Solution Set Definitions Rel-19
TS 29.007 vj00 PLMN-PSTN/ISDN Interworking Requirements Rel-19
TS 29.332 vj00 MGCF-IM-MGW Interface Protocol (Mn) Rel-19
TS 29.412 v1810 Trunking Gateway Control Procedures Rel-8
TS 29.424 v801 H.248 Profile for Trunking Media Gateways Rel-8
TS 31.111 vj30 USIM Application Toolkit (USAT) Specification Rel-19
TS 31.121 vi50 UICC-terminal interface test specification Rel-18
TS 31.829 vd00 ISIM Conformance Requirements Technical Report Rel-13
TS 32.101 vj00 Management principles and high-level requirements Rel-19
TS 32.102 vj00 Telecom Management Physical Architecture Framework Rel-19
TS 32.103 vj00 3GPP Management IRP Overview Rel-19
TS 32.111 vj00 Fault Management Requirements Rel-19
TS 32.150 vj00 IRP Concept and Definitions Rel-19
TS 32.153 vj00 IRP Technology-Specific Templates Specification Rel-19
TS 32.154 vj00 Backward Compatibility for 3GPP IRP Specifications Rel-19
TS 32.300 vj00 3GPP Network Resource Naming Convention Rel-19
TS 32.302 vj00 Notification IRP Information Service Rel-19
TS 32.303 v900 Notification IRP CORBA Solution Set Rel-9
TS 32.306 vj00 Configuration Management Notification IRP Solution Set Rel-19
TS 32.307 v1920 Notification IRP SOAP Solution Set Rel-9
TS 32.311 vj00 Generic IRP Management Requirements Rel-19
TS 32.312 vj00 Generic IRP Management Information Service Rel-19
TS 32.313 v900 Generic IRP CORBA Solution Set Rel-9
TS 32.316 vj00 Generic IRP Management Solution Set Definitions Rel-19
TS 32.317 v910 Generic IRP management SOAP Solution Set Rel-9
TS 32.323 v900 Test Management IRP CORBA SS Rel-9
TS 32.326 vj00 Test Management IRP Solution Set Definitions Rel-19
TS 32.343 v1900 File Transfer IRP CORBA Solution Set Rel-9
TS 32.346 vj00 File Transfer IRP Solution Set Definitions Rel-19
TS 32.347 v1900 File Transfer IRP SOAP Solution Set Rel-9
TS 32.353 v1900 Communication Surveillance IRP CORBA Solution Set Rel-9
TS 32.356 vj00 Communication Surveillance IRP Solution Set Rel-19
TS 32.363 v900 EP IRP CORBA Solution Set Rel-9
TS 32.366 vj00 EP IRP Solution Set definitions Rel-19
TS 32.367 v900 Entry Point IRP SOAP Solution Set Rel-9
TS 32.373 v1900 IRP Security Services CORBA Solution Rel-9
TS 32.376 vj00 Security services for IRP Solution Set Rel-19
TS 32.393 v910 Delta Sync IRP CORBA Solution Set Rel-9
TS 32.396 vj00 Delta Synchronization IRP Solution Set definitions Rel-19
TS 32.401 vj00 Performance Management Concept & Requirements Rel-19
TS 32.413 v900 PM IRP: CORBA Solution Set (SS) Rel-9
TS 32.416 vj00 PM IRP Solution Set Definitions Rel-19
TS 32.417 v900 PM IRP SOAP Solution Set Rel-9
TS 32.443 v910 Trace Management IRP CORBA Solution Set Rel-9
TS 32.446 vj00 Trace Management IRP Solution Set Definitions Rel-19
TS 32.506 vj00 Self-Configuration of Network Elements IRP Solution Set Rel-19
TS 32.507 v1910 Self-Configuration IRP SOAP Solution Set Rel-9
TS 32.523 v930 SON Policy NRM IRP CORBA Solution Set Rel-9
TS 32.526 vb70 SON Policy NRM IRP Solution Set definitions Rel-11
TS 32.602 vj00 Basic Configuration Management IRP Information Service Rel-19
TS 32.603 v910 Basic CM IRP CORBA Solution Set Rel-9
TS 32.606 vj00 Basic CM IRP Solution Set for CORBA/SOAP Rel-19
TS 32.607 v1910 CM IRP SOAP Solution Set Mapping Rel-9
TS 32.613 v1910 Bulk CM IRP CORBA Solution Set Rel-9
TS 32.616 vj00 Bulk CM IRP Solution Set Definitions Rel-19
TS 32.617 v900 Bulk CM IRP SOAP Solution Set Rel-9
TS 32.622 vb10 Generic Network Resources IRP NRM Rel-11
TS 32.623 v900 Generic NRM CORBA Solution Set Rel-9
TS 32.626 vb20 Generic Network Resources IRP Solution Set Definitions Rel-11
TS 32.643 v930 UTRAN Network Resources IRP: CORBA Solution Set Rel-9
TS 32.646 vc00 UTRAN NRM IRP Solution Set Definitions Rel-12
TS 32.652 vc00 GERAN Network Resources NRM for Configuration Management Rel-12
TS 32.653 v920 GERAN Network Resources IRP CORBA Solution Set Rel-9
TS 32.656 vc00 GERAN NRM IRP Solution Set Definitions Rel-12
TS 32.662 vj00 Configuration Management (CM); Kernel CM IRP Rel-19
TS 32.663 v1900 Kernel CM IRP CORBA Mapping Rel-9
TS 32.666 vj00 Kernel CM IRP Solution Set Definitions Rel-19
TS 32.667 v1900 Kernel CM IRP SOAP Solution Set Rel-9
TS 32.673 v900 State Management IRP CORBA Solution Set Rel-9
TS 32.676 vc00 3GPP TS 32.676: State Management IRP Solution Set Rel-12
TS 32.713 v900 TN Interface NRM IRP: CORBA Solution Set Rel-9
TS 32.716 vb00 TN NRM IRP Solution Set Definitions Rel-11
TS 32.722 vb00 Repeater NRM IRP: Network Resource Model Rel-11
TS 32.723 v900 Repeater NRM CORBA Solution Set Rel-9
TS 32.726 vb00 Repeater NRM IRP Solution Set Definitions Rel-11
TS 32.733 v910 IMS NRM IRP CORBA Solution Set Rel-9
TS 32.736 vb00 IMS NRM IRP Solution Set Definitions Rel-11
TS 32.743 v1900 CORBA Solution Set for STN IRP Rel-9
TS 32.746 vb00 STN NRM IRP Solution Set Definitions Rel-11
TS 32.753 v920 EPC NRM IRP CORBA Solution Set Rel-9
TS 32.756 vb00 EPC NRM IRP Solution Set Definitions Rel-11
TS 32.763 v1950 E-UTRAN NRM IRP CORBA Solution Set Rel-9
TS 32.766 vb90 E-UTRAN NRM IRP Solution Set Definitions Rel-11
TS 32.773 v900 HNS NRM IRP CORBA Solution Set Rel-9
TS 32.776 vb00 HNS NRM IRP Solution Set Definitions Rel-11
TS 32.783 v1900 HeNS NRM IRP CORBA Solution Set Rel-9
TS 32.786 vb00 3GPP TS 32.786: HeNS NRM IRP Solution Set Rel-11
TS 32.792 vb10 Generic RAN Network Resource Model (NRM) IRP Rel-11
TS 32.796 vc00 Generic RAN NRM IRP Solution Set Definitions Rel-12
TS 32.808 v1800 Common User Profile Storage Framework Rel-8
TS 32.818 v800 SA5 MTOSI XML Harmonization Study Rel-8
TS 32.824 v900 SOA and IRP Gap Analysis Rel-9
TS 32.832 va00 Alarm Correlation and Root Cause Analysis Study Rel-10
TS 32.866 vf00 REST, HTTP, JSON for Management Interfaces Rel-15
TS 32.880 vf00 Simplified Itf-N IRP Solution Sets Study Rel-15
TS 34.109 vj00 UE Conformance Test Functions for UMTS Rel-19
TS 34.114 vc20 Radiated Performance Test Procedure for UE/MS Rel-12
TS 34.229 vj21 IMS SIP/SDP UE Conformance Testing for 5GS Rel-19
TS 36.171 vj10 A-GNSS Minimum Performance Requirements for UE Rel-19
TS 36.509 vh40 EPC Special UE Conformance Testing Functions Rel-17
TS 36.579 3GPP TR 36.579 Rel-4
TS 37.171 vj00 UE Positioning Performance Requirements Rel-19
TS 37.355 vj20 LTE Positioning Protocol (LPP) Rel-19
TS 37.544 vg70 UE Radiated Performance Test Procedures Rel-16
TS 37.571 vj00 UE Conformance for Positioning Rel-19
TS 37.579 vi40 Mission Critical services conformance testing Rel-18
TR 37.901 vf10 UE Application Layer Data Throughput Performance Rel-15
TR 37.910 vj00 5G SRIT and NR RIT Self-Evaluation Report Rel-19
TR 37.911 vj00 3GPP 5G NTN Self-Evaluation Report Rel-19
TR 37.976 vj00 MIMO OTA Test Methodology Study Rel-19
TR 37.977 vj00 MIMO OTA Test Methodology Rel-19
TS 38.101 vj31 NR User Equipment Radio Transmissions Rel-19
TS 38.104 vj20 NR Base Station RF Requirements Rel-19
TS 38.151 vj00 NR UE MIMO OTA Performance Requirements Rel-19
TS 38.161 vj10 NR UE TRP and TRS Requirements for FR1 Rel-19
TS 38.171 vj10 5G A-GNSS UE Positioning Requirements Rel-19
TS 38.212 vj10 NR Multiplexing and Channel Coding Rel-19
TS 38.214 vj10 NR Physical Layer Procedures for Data Rel-19
TS 38.300 vj00 NG-RAN Overall Description Rel-19
TS 38.321 vj00 NR MAC Protocol Specification Rel-19
TS 38.508 vj11 5G NR UE Radio Transmission & Reception Rel-19
TS 38.509 vi00 Special conformance testing functions for UE Rel-18
TS 38.521 vj20 NR Physical Layer UE Conformance Testing Rel-19
TS 38.523 vj20 5G NR UE Conformance Testing: Idle/Inactive Rel-19
TS 38.551 vi30 User Equipment (UE) Multiple Input Multiple Output (MIMO) Over-the-Air (OTA) performance Rel-18
TS 38.561 vj00 UE Conformance for TRP/TRS FR1 Rel-19
TS 38.741 vj00 NTN L-/S-band for NR Technical Specification Rel-19
TS 38.761 vj00 MIMO OTA Performance Measurements for UE Rel-19
TS 38.762 vj00 Dynamic MIMO OTA Test Methodology for NR FR1 Rel-19
TR 38.810 vg70 NR OTA Test Methods Study Rel-16
TS 38.817 3GPP TR 38.817 Rel-4
TR 38.834 vh20 NR FR1 TRP/TRS Test Methodology Rel-17
TR 38.852 vh50 1900MHz NR band for European Rail Mobile Radio Rel-17
TR 38.853 vh50 900MHz NR Band for European Rail Mobile Radio Rel-17
TS 38.863 vj10 NR NTN RF and Co-existence Spec Rel-19
TS 38.870 vj20 Enhanced OTA Test Methods for NR FR1 TRP/TRS Rel-19
TS 38.873 vg00 NR Band n48 Technical Report Rel-16
TR 38.884 vi20 Technical Report Rel-18
TS 41.033 ve00 GSM Lawful Interception Interface Requirements Rel-14
TR 43.901 vj00 Generic Access to A/Gb Interface Feasibility Study Rel-19
TS 51.010 vj00 SIM Application Toolkit Conformance Testing Rel-19
TS 52.402 vj00 GSM Performance Management Measurements Rel-19
Patrick Zandl

About the author: Patrick Zandl (b. 1974)

Telecommunications specialist, technology journalist (founder of the Mobil server), and developer who has been running since 2025 — the largest Czech-language resource on AI-assisted programming. Formerly Chief Wizard Architect at Prusa3D and head of development for Turris at CZ.NIC; currently a consultant and instructor on AI implementation in companies.

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