Call flows of conference

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Call flows of conference
\ preethy varghese (7 Mar 2008)
. \ Rob Hillis (7 Mar 2008)

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Subject:	Call flows of conference
Group:	Asterisk-users
From:	preethy varghese
Date:	7 Mar 2008

Hi,
I have an astrisk pbx installed on my system and i have registered
two Aastra hardphones and one SJPhone(softphone) with that. Then i tested
the following scenario

A(Aastra) called B(Aastra)

B answered the call

I pressed conference button on the A ( A put B on hold)

A called C(SJPhone) (It send an invite with isfocus )

C answered the call

I pressed conference button on the A again

A B and C came in conference mode.

Then when I hangup the phone A , call between the B and C is also
disconnected.

Any one could you explain me this scenario with the sip message sequence?

What is the message sequence of a pbx centered conference?

Thanks in advance.

Preethy

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