IP Multimedia Subsystem (IMS)/Session Initiation Protocol (SIP)
What is IMS?
3G4G Blog on IMS
The IMS Tutorial at IMS Lantern
WHITE PAPERS AND TUTORIALS
IP Multimedia in 3G Mobile Networks - Ericsson
IMS Basics
IMS: IP Multimedia Subsystem: Part 1 - FTW
IMS: IP Multimedia Subsystem: Part 2 - FTW
IMS Procedures and Protocols: The LTE User Equipment Perspective - Spirent, May 2014
SIGNALLING (MSCs)
SIP to PSTN Sequence Diagram
SIP to ISDN PBX Sequence Diagram
SIP Originating Call with Authentication
IMS Registration Sequence Diagrams
IMS Subscriber to IMS Subscriber Call Flow
PSTN Subscriber to IMS Subscriber Call Flow
IMS Originating to PSTN Terminating Call Flow
SDP Use in an IMS-to-IMS Call (SDP Codec Selection and QoS Signaling)
IMS Presence Subscription and Notification
IMS Presence Resource List Subscription and Notification Flow
IMS Conference Call Flow Diagrams
IMS Push-to-talk over Cellular (PoC) Call Flow Diagrams
RELATED LINKS
The IMS Lantern Blog
IMS/SIP Portal
Session Initiation Protocol (SIP) Portal at Columbia.edu
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