Hi Jeffrey,
Please find the response below.
Regards,
--Vikram.
"Jeffrey" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
12/27/2006 01:59 PM
To
<[email protected]>
cc
Subject
[Sip-implementors] session-mode IM over 3GPP IMS
Dear there,
I have a question about session-mode IM over 3GPP IMS. If there are two
separated servers located at Application Server in 3GPP IMS Architecture,
one is SIP Call Server for advanced call feature processing, the other is
IM
Server for IM Service processing containing deferred messaging, IM logging
processing. As we know, both SIP Call and Session-Mode IM use SIP INVITE
for session establishment. So if a client sends a SIP INVITE request for
session-mode IM to S-CSCF, how does S-CSCF tell this INVITE is for IM
Server
not for SIP Call Server and then trigger this request to the right serving
server? How does iFC (initial Filter Criteria) set for this need? Or
S-CSCF
should parse the SDP within INVITE request then know it is for IM session
establishment so that forward this request to IM Server? Am I something
miss
on 3GPP IMS knowledge?
Vikram>>> INVITE will be routed by S-CSCF to the IM Server by the Filter
Criteria.
The Filter Criteria can return the IM Server address based on any of the
following
conditions:-
1> SIP Header name/value
2> Method
3> Session Type - Direction of the request
4> Request URI
5> Session Description
Hence, if any one of the above conditions match(in the Filter Criteria)
based on the received INVITE request,
then the Filter Criteria will return the IM Server Address (based on the
Filter Criteria Implementation) and the
call will be routed to the IM Server.
Also, you can refer to TS 29.228 - Table E.2 (XML schema for the Cx
interface user profile)
BR,
Jeffrey
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