Hello, I have got two zap channels configured in our asterisk server, one of them is connected to the PSTN directly and the other one is connected to a gsm track, only for mobile calls. Both of them are basic lines. I just connect an iax softphone (idefisk) to the asterisk PBX. If I make a mobile call using the zap channel connected to a gsm track, the mobile I phoned does not hear me nothing. But If the call is made using the zap channel directly connected to the PSTN, both end points hear perfectly. Why this is happening? How could I solve that? Any clue will we wellcomed. Thanks in advance. VoipCrazy -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20070403/cf724552/attachment.htm