Where should I configure so that ulaw & alaw is used inside the organization, and G729 is used on the trunk?

Question

Asterisk

There is FreePBX 2.8.1 on asterisk 1.8, a trunk configured for a sip provider that works only through G729, as well as softphones that only know about ulaw / alaw and a few other free codecs.
Tell me, please, where you need to configure it so that ulaw & alaw is used where possible inside the organization, and G729 is used on the trunk?
How to set up transcoding on the server? Is it to record calls? For calls coming from the provider are not written.

Answer 1

In users.conf, the disallow and allow options are applied in the order specified

[general]
disallow = all
allow = alaw
allow = ulaw
...
[g729-user]
disallow = all
allow = g729

Transcoding works by default, all recordings are made in wav, regardless of the codec. Stored in /var/spool/asterisk/monitor/
The command core show translationshows the available codecs and the time spent transcoding between them.

Answer 2

Thanks, my cant, g729 was the first in my allow