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Marty,
Ahhh.... I wasn't thinking about the fact that it would be keyed of the
callers settings, rather than the callee's.
However, setting the slow-link phone to g729 isn't a very workable
solution. We want to have ulaw as a backup, in case all of our g729 licenses are
in use. Having the call completely fail in this case would be very bad. We
should be able to have the slow-link phone negotiate to
ulaw.
Doug.
On Jul 20, 2006, at 10:16 AM, Douglas Garstang wrote:
I'm a little confused about Asterisk codec negotiation. Hopefully
someone can help.
I
have two phones, one on a slow link where I'd like to use G729, and one on a
fast link where I'd like to use ulaw.
My
sip.conf has:
[general]
allow=ulaw
allow=g729
...
[slow-phone]
allow=g729
allow=ulaw
Firstly, does setting the codec for the slow-link phone override the
general settings? Of course it's not actually documented
anywhere.
When the fast link phone calls the slow link phone, it sends ulaw and
G729 in that order to Asterisk. When Asterisk relays the INVITE to the slow
link phone, it does not change the codec preference, and sends ulaw followed
by G729. I end up with a call that's ulaw on both legs, which isn't what I
want.
I
guess the settings in [slow-phone] aren't overriding the settings in
[general]. That's bad...
How can I work around this? As you
already stated in your previous post the slow phone codec pref does override
general when it's the caller.
I think the calling parties codec preferences are respected. That
is why I suggested the last time you posted this that you "force" the slow
link to g729 (allow that only), as that will cause the calling party (fast) to
choose g729 also...
I remember reading this described somewhere, but can't find the docs at
the moment.
HTH,
Marty
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