[Freeswitch-users] How to setup codec g729 pass through

Hi All, I used the FS SVN 7768, the conf is default. How can i modify it to get codec G729 or G723 by pass working? how to setup the settings in SIP_profiles: <param name="codec-prefs" value="$${outbound_codec_prefs}"/> <param name="inbound-codec-negotiation" value="generous"/> Thanks for your time to answer my question. Steven