I have searched google and the voip wiki and I have found nothing. There is an error that I keep getting when a particular user is talking on the phone. Jul 22 18:45:15 NOTICE[21902]: rtp.c:509 ast_rtp_read: Unknown RTP codec 72 received Jul 22 18:45:18 NOTICE[21902]: rtp.c:509 ast_rtp_read: Unknown RTP codec 72 received The use is the only person using a worldaccxx box as an ATA. Any ideas what this could mean? Regards, Ryan Williams -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20050722/08bcb716/attachment.htm