Hi, I have installed a fax machine on a HT 486 ATA in my office, and it works perfectly, to send and receive faxes. When I install the same ATA on a fax machine at home (behind a NAT, in case it matters) faxes are received correctly, but I cannot send. Asterisk keeps showing a message "Unknown RTP codec 96 received" I am using g711u as the default codec. Does anyone have any idea or have already been through this problem? Thank you Dov -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20060309/5e3c9122/attachment.htm