Subject: [SIP] multiple calls for IP telephony client

From: "Arnoud van Wijk (ELN)" <[email-masked]>
Date: Tue, 28 Nov 2000 17:19:28 +0100

While I was thinking about functionality of the User Agents for IP telephony. I got myself tangled in the following:

A call is one or more sessions ----> no problem, all sessions have the same Call_ID
This means that if A initiates a call, and B receives the call and B will then add 2 minutes later another session (a text session for relay purposes or a seperate video stream), it will be considered to be the same call? I know that SIP can just do this within the same call_ID via a re-invite.
But if B wants the text stream or video stream  
But if B's session is seen as a new call, does it mean that the IP telephony client is handling 2 seperate calls? I know that technically this does not matter for the client, but practically this may confuse the clients, since most people will deal with one call at the time and not simultaneously.

Maybe I am overlooking some things. I hope that you understand my question. :-)

A second question is:
Can the originator of a session be found in the re-invite?
If A calls B with session 1 and B comes then with session 2, the re-invite (adding session 2 to session 1) has then from: [email-masked]?
even that originally the invite (session 1) was reading from: [email-masked] (A started the call)?
I do believe so.

(been a long day:-)

Thanks for your time.

Arnoud

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ERICSSON EUROLABS NETHERLANDS BV
Arnoud van Wijk
ABACUS Lab
Research & Development (ELN/V)
Fax: +31-161 247569
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