He’s looking for media_mix_inbound_outbound_codecs the incoming codec from the inbound GSMopen channel is L16… so that gets sent out because he doesn’t have media_mix_inbound_outbound_codecs set to true… see https://freeswitch.org/confluence/display/FREESWITCH/Codec+Negotiation From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Giovanni Maruzzelli Sent: Thursday, July 14, 2016 4:41 PM To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org> Subject: Re: [Freeswitch-users] INCOMPATIBLE_DESTINATION - GSM (L16) to User Yes, this is because of codecs. Have you edited vars.xml ? You are sending out a nonexisting codec (L16)... Please put vars.xml and all codec related configurations back to their original value. No need to touch them at all for gsmopen to work. -giovanni On Thu, Jul 14, 2016 at 11:29 PM, Luiz Fernando Softov <fernando@softov.com.br <mailto:fernando@softov.com.br> > wrote: Hi, I'm trying to make a call between GSMOpen (GSM) and a user (or a group, it's the same). But I receive a 488 INCOMPATIBLE_DESTINATION I'm thinking this is because the codec negotiation. My profile: https://pastebin.freeswitch.org/view/2f8a0f95 My FS LOG https://pastebin.freeswitch.org/view/f6fc8bac Please, someone know how to solve this? _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org <mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org <mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org -- Sincerely, Giovanni Maruzzelli Cell : +39-347-2665618