When attempting to call one of the example numbers, like 17474745000, I only get "488 Not Acceptable Here". It works fine when I configure the softphone (Xten X-Lite) to use sipphone's server directly. Am I missing something? Here's my relevant config sections: sip.conf: in [general]: register => 17472442457:mypassword@proxy01.sipphone.com [sipphone] type=friend host=proxy01.sipphone.com username=17472442457 secret=mypassword fromuser=17472442457 fromdomain=proxy01.sipphone.com ;also tried it with these ;disallow=all ;allow=ulaw ;allow=alaw ;allow=g729 extensions.conf: [default] exten => _1747NXXXXXX,1,SetCallerID(${SIPPHONENUMBER}) exten => _1747NXXXXXX,2,SetCIDName(${NAME}) exten => _1747NXXXXXX,4,Dial(SIP/${EXTEN}@sipphone) exten => _1747NXXXXXX,5,Playback(invalid) exten => _1747NXXXXXX,6,Hangup And some sip debug output: Sip read: SIP/2.0 100 trying -- your call is important to us Via: SIP/2.0/UDP 142.59.15.250:5060;branch=z9hG4bK0b1543f4 From: "Christopher" <sip:17472442457@proxy01.sipphone.com>;tag=as5fc6d603 To: <sip:17474745000@proxy01.sipphone.com>;tag=000019E038902017 Call-ID: 6da351d10da9c295403a59fb7ac416ce@proxy01.sipphone.com CSeq: 103 INVITE Server: Sip EXpress router (0.8.14-2 (i386/linux)) Content-Length: 0 Warning: 392 198.65.166.131:5060 "Noisy feedback tells: pid=17299 req_src_ip=142.59.15.250 req_src_port=5060 in_uri=sip:welcome_call+17472442457@198.65.166.130 out_uri=sip:welcome_call+17472442457@198.65.166.130 via_cnt==1" 9 headers, 0 lines Sip read: SIP/2.0 488 Not Acceptable Here Via: SIP/2.0/UDP 142.59.15.250:5060;branch=z9hG4bK0b1543f4 From: "Christopher" <sip:17472442457@proxy01.sipphone.com>;tag=as5fc6d603 To: <sip:17474745000@proxy01.sipphone.com>;tag=000019E038902017 Call-ID: 6da351d10da9c295403a59fb7ac416ce@proxy01.sipphone.com CSeq: 103 INVITE Contact: <sip:bye+17472442457@198.65.166.130> Server: Sip EXpress router (0.8.12-tcp_nonb (i386/linux)) Content-Length: 0 Warning: 392 198.65.166.130:5060 "Noisy feedback tells: pid=28177 req_src_ip=198.65.166.131 req_src_port=5060 in_uri=sip:welcome_call+17472442457@198.65.166.130 out_uri=sip:welcome_call+17472442457@proxy01.sipphone.com via_cnt==0"