Hello I'm still fighting with the codec negotiation with carriers (as I am unable to understand how in FreeSWITCH) and I have seen something, I do not know if it's a bug. If I use a variable in the specification of output codecs do not see a corresponding message sip, however if specified in the parameter, if negotiated with the carrier. <!--global_codec_prefs=VB32,G7221,speex,PCMU,PCMA,BV16,G726-32,iLBC,GSM,G729,G723,AMR--> <!--carriers_codec_prefs=PCMU,PCMA,G729,G723,AMR,VB32,G7221,speex,BV16,G726-32,iLBC,GSM--> <param name="codec-prefs" value="$${carriers_codec_prefs}"/> <param name="inbound-codec-prefs" value="$${carriers_codec_prefs}"/> <param name="outbound-codec-prefs" value="PCMU,PCMA,G729,G723"/> <param name="inbound-codec-negotiation" value="greedy"/> <param name="inbound-late-negotiation" value="true"/> http://pastebin.freeswitch.org/18782 ----------------------------------------------------------------------------------------------- <param name="codec-prefs" value="$${carriers_codec_prefs}"/> <param name="inbound-codec-prefs" value="$${carriers_codec_prefs}"/> <param name="outbound-codec-prefs" value="$${carriers_codec_prefs}"/> <param name="inbound-codec-negotiation" value="greedy"/> <param name="inbound-late-negotiation" value="true"/> http://pastebin.freeswitch.org/18784 Do not understand why in one case send sip message and not in another (in this cancel the call because it does not handle the negotiation). What can be?. Thanks !!! Best regards Anto