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[Msrp] Clarification related to change in recent draft


Hi All,
    I have 2 questions regarding recent MSRP draft released.
 
1) In the latest draft (draft-ietf-simple-message-sessions-13) there is a change when compared to the previous draft numbered 12.
In section 5.1 the last but one paragraph states as given below.
 
.......... The ability to interrupt messages allows multiple sessions to share a TCP connection, and for large messages
to be sent efficiently while not blocking other messages that share the same connection, or even the same MSRP session.
Any chunk that is larger than 2048 octets MUST be interruptible.  ....................................
 
The colored text is the change. Can you please explain what "MSRP session" here means?
Does that mean the session which is established using SIP or it refers to the media session that follows the SIP signalling?
 
2) multiple sessions can share a same TCP connection.
 So if we have 2 applications listening on the default port, say 6000 ( which might be standardized later) and if we receive a SEND request,
how do we arbitrate among the applications? There should be some protocol specific parameter based on which the MSRP stack can give the event to an application.
How do we do that in MSRP?
 
Please help me in finding answers to the above questions.
 
Thanks & Regards,
Srinath.