Covid 19 Update: Given the current global situation, we have paused the delivery of our LiveOnsite courses, but our LiveOnline and OnlineAnytime Packages remain unaffected. Browse over 50 online courses in our course catalogue, or get in touch to register your interest in future LiveOnsite courses when we are able to safely resume in person training.

IM-SSF - IP Multimedia – Service Switching Function

The IM Basic Call State Models are used to define the call processing architecture within the IMS that is recognizable to the CSE and are identical to those defined for call control in traditional network functions such as the MSC (Mobile Switching Centre). The Basic Call State Models are logically located within the IM-SSF which performs the mapping process between SIP methods passed across the ISC and Detection Points that will be used to initiate dialogue with the CSE.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

Explore NetX today with a
free trial.
More Info about NetX