S-CSCF
Serving – Call Session Control Function

The S-CSCF is the primary node in the IMS responsible for session control. Subscribers will be allocated a S-CSCF for the duration of their IMS registration in order to facilitate routing of SIP messages as part of service establishment procedures. Consequently, the S-CSCF will download a subscriber profile from the HSS (Home Subscriber Server) at the time of registration, which allows the S-CSCF to ascertain which Application Server any service requests should be sent to. The S-CSCF will also be involved in breakout to the PSTN, if this is supported.

If you enjoy using our glossary, here are some other useful resources you might like...

Get your weekly dose of telecoms terminology delivered straight to your inbox!

We promise, no spam - just clear-cut telecoms terms to keep you on top of your game.

Subscribe

Our YouTube channel offers over a hundred free videos (and counting!) covering a range of technology topics.

Subscribe to our channel to be the first to know when we release new videos:

FREE Intro to 5G Sample Course

Use this no-obligation free trial to get a taste of what it's like to be an Mpirical student.

Included with the trial is an all-access pass to the LearningZone, which contains learning tools and other useful resources to help you make the most of your training.

Start My Free Trial