IMS and SIP


I wish you liked the earlier mindmaps about IPSec and ANDSF. Today let me share two more mindmaps related to telecom domain. IMS : IP Multimedia Subsystem is again became buzzword due to VoLTE: Voice over LTE. SIP is key protocol to realize IMS and VoIP: Voice over IP. Here, let me share my understanding about SIP and IMS both. 








* IMPU: IMS public Identity
- SIP URI
- Tel URI
For requesting communication
Linked with SIM card

* IMPI : IMS Private Identity
For authoraization / registration
Linked with profile

* Globally Routable User Agent URI (GRUU)
IMPU + Instance ID linked with device. (e.g. IMEI)

* Service Profile
1.1 IMPU
1.2 CN Service authoraization
1.3 iFC (Initial Filter Criteria)
1.3.1 AS
1.3.2 Trigger Point
1.3.2.1 Service Point Trigger

* Access n/w

1. PS [IP-CAN]
2. CS [IMS Centrilized Services :ICS] 

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