The IP Multimedia Subsystem core
IMS is an architecture for real-time multimedia (voice, data, video, and messaging) services using a common IP network. It defines a layered architecture. According to the 3GPP specification, IMS entities are classified into six categories:
- Session management and route (CSCF, GGSN, and SGSN)
- Database (HSS and SLF)
- Interworking elements (BGCF, MGCF, IM-MGW, and SGW)
- Service (Application Server, MRFC, and MRFP)
- Strategy support entities (PDF)
- Billing
Interoperability with the SIP infrastructure requires a session border controller to decrypt the WebRTC control and media flows. A media node is also set up for transcoding between WebRTC codecs and other legacy phones. When a gateway is involved, the WebRTC voice and video ...
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