I have someone who is linking their asterisk server to me via sip. When I try to send them a call, on their end they see: Jan 31 12:36:28 NOTICE[3716] chan_sip.c: Failed to authenticate user "+15703232166" <sip:+15703232166 at 63.174.244.172>;ta g=as7facadd4 I know I can use IAX, but in this situation we really need to be able to use SIP.