On Jul 17, 2006, at 9:25 AM, Douglas Garstang wrote:
I have two polycom phones. One on a slow link, and one on a fast one.
I'm trying to set the phone on the slow link to use G729 as it's first
preference, and the phone on the fast link to use G711 as it's first
preference.
sip.conf has:
[general]
allow=ulaw
allow=g729
[slow-link] ; Override codecs for slow link phone.
allow = g729
allow = ulaw
When the slow link phone dialls the fast link phone, it sends G729 as
it's first preference in the INVITE to Asterisk. Asterisk then sends
G729 as the first preference in the INVITE to the fast link phone. Why
doesn't Asterisk send G711 instead?
Because you set the calling to prefer g729? What did you expect?
This raises an interesting question. If one phone uses G729, and one
G711, then Asterisk is going to have to transcode, and I am going to
use up a G729 license. It would seem more beneficial for it to work
the way it is now.
Exactly. In fact I would generally force g729 in that case (ie
disallow all but g729).
That is, both legs are using G729. Why is this better? It doesn't chew
up a G729 license as there is no transcoding, and heck, if one of your
call legs is G729, then the G711 party isn't going to hear anything
better anyway.
Yes this is clearly a win.
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