[asterisk-users] Codec Negotiation

[Douglas Garstang]

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?
 
Doug.
 
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