Hi All.
Call conference is a special case when a third party UA3 wants to join in
the conversion between UA1 and UA2 .
If we consider the above and draw a call flow , the flow will be something
like below
UA1 UA2 UA3
<--------------------------------------->
INV/180/200/ACK/ RTP Set
<------------------------------------
INV
----------------------------------->
180 Ringing
<------------------------------------------
INV
-------------------------------------------->
200 Ok
<--------------------------------------------
ACK
------------------------------------------>
200 Ok
<--------------------------------------
ACK
Now when UA3 wants to join the conference It send a invite to UA2 . The
callID in this case is independent as all call intiating user agent (
Sending INV) can have independent call ID .
The 180 Ringing t this INv has the same call ID as the Invite ( Intiated by
UA3)
Then UA2 parse the INV to UA1 .. This time it sends with the previous call
ID ( Intiated by UA1 )
The call leg between UA1 and UA2 will have the call ID intiated By UA1.
( UA2 -> INV ->UA1 , UA1- > 200 ok ->UA2 , UA2 - > ACK ->UA1)
When UA2 Sends / receive 200 / Ack , it will have the cal ID Intaited by
UA3.
Hope this will help u .
So in a nutshell ,
The call leg between UA1 and UA2 will have the call ID intiated By UA1.
The Dialog between UA3 and UA2 will have teh call ID intaiated By UA3
Regards,
Birkamaditya Panda
On Feb 7, 2008 3:20 PM, santoshkumar pati <[EMAIL PROTECTED]>
wrote:
> Hi All,....
> Can Any body tell me, About the significant of the Call Id Header,
> In the case of Call Conference, Whether it is the same or
> is changing, when a user is joining or addition of a user into the
> dialog....
> Regards
> santosh
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