[asterisk-users] 3way calling / codec problem

[Mr. Jones]

I'm having problems with conference calls (3-way) when I have my codec
forced to g729 in sip.conf.

I'm using Grandstream 2000s.

If enable both g711 and g729 then 3 way calling and transfers work.

I'm not sure why this would matter?

Here's the error:

Oct 13 13:54:45 NOTICE[31184] chan_sip.c: No compatible codecs!

Any help is greatly appreciated!