Restrict the codecs so it only use G729 for outbound calls
- At the ARS rule [Pattern OUT] where you want to use G729 only for the outbound calls, set as following
set [Pattern OUT]>[Codec Priority] as 18,0
save the change
- On your UA configuration, ensure that you select only G.729 for codec type. If both endpoints choose to use G.729 only, then G.729 should be used.