Subject: [Sip] dialog identifiers

From: "Salva Rey Calatayud" <[email-masked]>
Date: Wed, 26 Apr 2000 10:35:24 +0200

Hi,

	I have a doubt regarding the concept of a dialog when a session 
is made up by several participants.

	is there any relation between the call-id of all the dialogs that 
make up a session?

	Here is an extract from rfc-2543-bis09 

<bold><color><param>0100,0100,0100</param><FontFamily><param>Times New Roman</param>Abstract

</bold>The Session Initiation Protocol (SIP) is an application-layer control 
(signaling) protocol for creating, <FontFamily><param>Arial</param><smaller><smaller>15

<FontFamily><param>Times New Roman</param><bigger><bigger>modifying, and terminating sessions with one or more participants. <FontFamily><param>Arial</param><smaller><smaller>16

<bigger><bigger>(309) ...<FontFamily><param>Times New Roman</param><bigger>. SIP can also invite participants to already existing 
sessions, such as multicast conferences.</color><FontFamily><param>Arial</param><smaller>

 (line 594) <color><param>0100,0100,0100</param><FontFamily><param>Times New Roman</param><bigger>The most important method in SIP is the <FontFamily><param>Arial</param>INVITE 
<FontFamily><param>Times New Roman</param>method, which is used to establish a session between participants. 
A session is a collection of participants, and streams of media 
between them,... Section 13 discusses how sessions are initiated, 
resulting in one or more SIP dialogs.

(2069) when multiple 2xx responses are received from different 
remote UAs (because the <FontFamily><param>Arial</param>INVITE <FontFamily><param>Times New Roman</param>forked), each 2xx establishes a 
different dialog. All these dialogs are part of the sa
me call.

	Now<FontFamily><param>Arial</param><smaller> it seems to me that all these participants correspond to 
the endpoint where a single user can be reached, what about the 
other "participants" in the session? How are they "invited"? Are two 
different concepts of session being used here, namely, at a sip 
signalling level with only endpoint, and at a call level?

thanks,

Salva</color>

_______________________________________________
Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use [email-masked] for questions on current sip
Use [email-masked] for new developments on the application of sip