Hello,

I have two queries  -
 
1) When we say there is a SIP Conference ie more than two parties are in one 
call session then how call-id are maintained that is Call -id remains same or 
changes ,more precisely if SIP Client-A want to invite Client-B and C for call 
,it sends a SIP INvite to SIP server-A and ask it to call B and C. Now when SIP 
server will send two Invites ,one to B and second to c will all these Call IDs 
be different or same.

2) Same is for Push To Talk(PTT) , when there is a chat session established 
between multiple clients , are the Call id s same or different or else how one 
can correlate different messages belong to one session ?/ is there any session 
id or some other unique field present ??

Please also suggest if anyone have some study documnt regarding this.

Thanx
Shiva


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