I've successfully got the channel from phone->PBX working on G279. I'm just trying to get the PBX->trunk to also be G279.
I did this by using FreePBX and putting in allow=g729,ulaw into each extension. As I'm using FreePBX and no asterisk expert I wanted to avoid editing sip.conf if possible.
The question is, how can get the same effect for the trunk?
Best Answer
I am assuming that you have g729 codec module at this point.
In your trunk configuration page, in PEER Details fields
add
disallow=all
allow=g729
Make sure you do it in the same sequence as above. Also do the same in USER Details if you have any entry in this field.