Restrict outbound call codecs to G729
Restrict the codecs so it only use G729 for outbound calls
1. 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
2. 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.