Next step is packet capture to see if there is a clue as to the cause of
the failure in the SIP signalling.

On Tue, Jan 20, 2015 at 10:41 AM, Jordan Cook - Gyron Networks <
[email protected]> wrote:

> We were using G722 - I thought similarly and tried a call with alaw. Same
> problem occurred, any other ideas?
>
> > I'm willing to bet you are forcing the use of G729.  7940 and 7960
> phones can
> > only do a single G729 channel, and if you require G729 for the second
> leg of a
> > conference, it will fail.
>
>
>
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