Hi Brian, No it does not do what I expect. When I make outgoing calls from a Freeswitch extension (using GSM) and then out to a gateway using PCMU everything works fine. When I receive calls from the same gateway, the end point behind the gateway can't hear me. The GSM-PSMU (and viceversa) transcoding for outgoing from an endpoint associated with a Freeswitch extension to the external gateway is perfect but incoming there seems to be an issue. Any ideas? Maxim. From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Brian West Sent: November-29-08 5:34 PM To: freeswitch-users@lists.freeswitch.org Subject: Re: [Freeswitch-users] Configuring different codecs for internal and external calls. Does it do what you expect? /b On Nov 29, 2008, at 7:19 PM, Maxim Karp wrote: Is this it? <X-PRE-PROCESS cmd="set" data="global_codec_prefs=GSM"/> <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=PCMU,PCMA"/>