In the following scenario: vars.xml: <X-PRE-PROCESS cmd="set" data="media_mix_inbound_outbound_codecs=true"/> internal.xml: <param name="inbound-codec-prefs" value="G722, PCMU, PCMA, G729"/> <param name="inbound-codec-negotiation" value="generous"/> <param name="inbound-bypass-media" value="false"/> <param name="inbound-proxy-media" value="false"/> <param name="inbound-late-negotiation" value="false"/> <param name="inbound-zrtp-passthru" value="false"/> external.xml: <param name="inbound-codec-prefs" value="G722, PCMU, PCMA, G729"/> <param name="inbound-codec-negotiation" value="generous"/> <param name="inbound-late-negotiation" value="false"/> <param name="inbound-zrtp-passthru" value="false"/> ...with no further modifications performed on the dialplan. I expect this result: A ---> offers G729 ---> FreeSWITCH ---> offers ---> G729, G722, PCMU, PCMA ---> B ...but I get this result: A ---> offers G729 ---> FreeSWITCH ---> offers ---> G722, PCMU, PCMA, G729 ---> B I'd like FreeSWITCH to offer B all the codecs from the list, but sorted accordiing to A's preference. Can you help me figure out the settings? Thanks, Rogelio Perez