I get 8 to 12 of these messages at the beginning of a call to a Cisco 7940 SIP phone: Nov 13 17:27:56 NOTICE[27203]: rtp.c:1146 ast_rtp_raw_write: RTP Transmission error to 192.168.1.254:32472: Operation not permitted Other than these messages, the call proceeds normally. From the code I see Asterisk is attempting to send DTMF digits. In SIPDefault.cnf I have "dtmf_inband: 1" In sip.conf I have tried "dtmfmode=rfc2833", "dtmfmode=inband", and "dtmfmode=info". Asterisk 1.0.7. What is confusing is that these messages started appearing this past week with no apparent changes to the configs. Can anyone help me with this? Thanks, -- Michael Welter Telecom Matters Corp. Denver, Colorado US +1.303.414.4980 mike@TelecomMatters.net www.TelecomMatters.net