Hi all,
I am new on board. I was wondering if the description of the ISC interface between the CSCF and any Application server has been ever public. The reason for my question is, what should a developper care about when developping an SIP AS that is to inter operate with any IMS CSCF

Further, I there a list of simple description or explanation of the Gm, Sh, Mx, etc interface apart of the 3GPP/TISPAN technical. This is required for tutorial activity

Thanks

JP

Hi JP,

The ISC interface is well defined. The interoperability that you are talking about does depend on the release spec that the CSCF is based upon. Here are the 3GPP/3GPP2 links for ISC:

http://www.3gpp.org/ftp/Specs/html-info/23228.htm
http://www.3gpp2.org/public_html/specs/X.S0013-002-A_v1.0_051103.pdf

Depending on the kind of SIP Application, perhaps the most important thing for a developer to adhere to would be the SIP Private Headers (P-Headers RFC3325, RFC3455). For example, you will find that older SIP applications (and SIP stacks) don't work at all with the latest OpenIMSCore.

I haven't come across any tutorial type documents explaining the Gm, Sh and Mx interfaces - For this I would suggest a hardcover book from Amazon.com -> http://www.amazon.com/s/ref=nb_ss_gw/002-4096502-0664024?url=search-alias%3Daps&field-keywords=ims

Hope this helps.

Regards,

Mike