[OpenSIPS-Users] Scope of IMS in OpenSIPS - RFC

Bogdan-Andrei Iancu bogdan at opensips.org
Tue Nov 28 13:02:18 UTC 2023

Hi all,

(disclaimer : cross lists posting is not a good practice - we will do 
this only to catch the attention and get momentum with this initial topic)

As a first step here, is to work out the scope of the IMS implementation 
in OpenSIPS. IMS is a vast concept, with SIP and non-SIP components, and 
we want to understand and agree on which components of IMS may be 
subject of work from the OpenSIPS perspective. For example, we do 
consider the CSCF as a must here, but we may explore the HSS, AS, MGW or 
other components.

 From the OpenSIPS perspective, we look for IMS components which are SIP 
related. At least as a starting point. So, the first obvious candidate 
is the *Call Session Control Function (CSCF)*. And here we need to look 
into and address the specific functionalities of each sub-component:
     * P-CSCF
     * I-CSCF
     * S-CSCF

Again, these are the pretty obvious components, still may look into and 
evaluate (if of an interest of the OpenSIPS IMS implementation) areas as:
     * HSS (from interconnection perspective)
     * MGCF / MGW  (from interconnection perspective)
     * SIP AS
     * others ?

Any feedback (with explanations and arguments) about what we should 
consider for our IMS implementation is more the welcome. I set here just 
a simple starting point, with no limitations or so. Feel free to 
contribute to the topic

Best regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
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