[SIPForum-discussion] SIP conference call

mehmet eng.mehmetozi at gmail.com
Tue Sep 27 06:29:34 UTC 2011

Addition to above response, there could be different flows with the
compatibility within the RFC 4353.

2011/9/27 mehmet <eng.mehmetozi at gmail.com>

> Hi,
> Firstly assume that one call in hold and other is active.
> Initiator first sends re-invite for hold to the active call.Then sends
> INVITE to the server with the conference-uri in  the request line.Then sever
> creates focus and sends 200 OK indicating with "isfocus" string in the
> contact header.Also sends a specific conference uri inside the contact
> header which belongs to this connference.
> Then initiator sends two REFER messages to the held phones, to transfer the
> conference.Again configures the "Refer-to" header with the specific
> conference-uri and "isfocus" string.
> Now when the server recevied both these REFER messages, it can act as
> B2BUA, and sends two held phones re-invite indication with "isfocus" string.
> And server returns the correct responses for the REFER messages as it the
> other phones received the REFER and returned successfull responses.
> Then after successfull negotiaons all three phones sends SUBSCRIBE messages
> to subscribe to focus in order to receive the changes belonged to the
> conference.
> Now conference has been created.
> I hope this explanation would be helpfull :)
> Beside this I suggest to read http://www.packetizer.com/rfc/rfc4353/ (A
> Framework for Conferencing with the Session Initiation Protocol (SIP)
> Best Regards.
> Mehmet
> 2011/9/25 Enthiran k <enthirann100 at gmail.com>
>> Hi
>> It would be great if any one can respond me immediately
>> am having two legs and both are in held state.. ( or one in held and other
>> in active )  now when i press the conference button what message would go
>> ??
>> cosidering the user is not a media mixer and thats done only by his SIP
>> proxy.
>> i want to understand exactly what message will be sent when i press the
>> conference button ??:
>> plss help
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