Hi all, I am worried because on my production asterisk servers, I am receiving these errors every 2-3 minutes. my log files are full of them: WARNING[xxx] app_dial.c: Unable to forward voice or dtmf and also, less frequent: WARNING[xxx] app_dial.c: Unable to write frame How can I find out what is causing this problem? If anybody can point me in the right direction I would be very grateful. My server is on a public IP address, and all of my customers are behind NAT. I have set canreinvite=no to keep RTP traffic and thus make it easier to get around NAT issues. All of these calls are terminated at another asterisk server with E1 connections, so there is only one place where NAT is present in our network. Also, all of the calls are inbound (NAT'ed customers call the public IP asterisk server) Regards, Alex