3G/4G/5G
IMS
IP Multimedia Subsystem
Rel-5 (2003)
Overview
The access-agnostic subsystem delivering VoIP, VoLTE, VoNR, and multimedia services over IP.
Full technical content for IMS is coming soon. In the meantime, browse the related specifications below.
Specifications
TS 23.216
Single Radio Voice Call Continuity (SRVCC); Stage 2
Architecture
Rel-16TSIMSUpdated 2020-07-03
TS 23.228
IP Multimedia Subsystem (IMS); Stage 2
Architecture
Rel-17TSIMSUpdated 2023-04-05
TS 24.229
IP Multimedia Call Control Protocol Based on SIP and SDP; Stage 3
Protocol
Rel-17TSIMSUpdated 2023-04-05
TS 26.114
IP Multimedia Subsystem (IMS); Multimedia Telephony; Media Handling and Interaction
Services
Rel-17TSIMSUpdated 2022-06-21