Hi, one of my ITSP is using Cisco 2811 (IOS 12.4) as H.323 to SIP gateway for SIP trunk to my Freeswitch. I noticed that it sends INVITE message without SDP, and then Freeswitch terminates the call. I tried using 3pcc parameter as "proxy" and as "true", but no avail. Is this expected behavior, and could I fix it somehow? Here's SIP trace: ------------------------------------------------------------------------ recv 784 bytes from udp/[192.168.117.8]:51358 at 08:06:51.013018: ------------------------------------------------------------------------ INVITE sip:100965461@192.168.117.9:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.117.8:5060;branch=z9hG4bK721016 From: <sip:xxxxxxxxxxxx@192.168.117.8>;tag=21811124-711 To: <sip:100965461@192.168.117.9> Date: Fri, 14 Sep 2012 08:07:14 GMT Call-ID: 6DE7A86-FD7A11E1-859AE929-E0E81CE1@192.168.117.8 Supported: 100rel,timer,replaces Min-SE: 1800 Cisco-Guid: 2649593691-218042625-2288844833-673556762 User-Agent: Cisco-SIPGateway/IOS-12.x Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE, NOTIFY, INFO, UPDATE, REGISTER CSeq: 101 INVITE Max-Forwards: 70 Remote-Party-ID: <sip:xxxxxxxxxxxx@192.168.117.8>;party=calling;screen=yes;privacy=off Timestamp: 1347610034 Contact: <sip:xxxxxxxxxxxx@192.168.117.8:5060> Expires: 180 Allow-Events: telephone-event ------------------------------------------------------------------------ send 372 bytes to udp/[192.168.117.8]:5060 at 08:06:51.013018: ------------------------------------------------------------------------ SIP/2.0 100 Trying Via: SIP/2.0/UDP 192.168.117.8:5060;branch=z9hG4bK721016 From: <sip:xxxxxxxxxxxx@192.168.117.8>;tag=21811124-711 To: <sip:100965461@192.168.117.9> Call-ID: 6DE7A86-FD7A11E1-859AE929-E0E81CE1@192.168.117.8 CSeq: 101 INVITE Timestamp: 1347610034 0.000000 User-Agent: FreeSWITCH-mod_sofia/1.3.0+git~20120907T231757Z~c2893801cb Content-Length: 0 ------------------------------------------------------------------------ send 889 bytes to udp/[192.168.117.8]:5060 at 08:06:51.036020: ------------------------------------------------------------------------ SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.117.8:5060;branch=z9hG4bK721016 From: <sip:xxxxxxxxxxxx@192.168.117.8>;tag=21811124-711 To: <sip:100965461@192.168.117.9>;tag=vUg243Ng67UHD Call-ID: 6DE7A86-FD7A11E1-859AE929-E0E81CE1@192.168.117.8 CSeq: 101 INVITE Contact: <sip:mod_sofia@192.168.117.9:5060> User-Agent: FreeSWITCH-mod_sofia/1.3.0+git~20120907T231757Z~c2893801cb Accept: application/sdp Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY Supported: timer, precondition, path, replaces Allow-Events: talk, hold, conference, refer Min-SE: 1800 Content-Type: application/sdp Content-Disposition: session Content-Length: 205 v=0 o=FreeSWITCH 1347586709 1347586710 IN IP4 192.168.117.9 s=FreeSWITCH c=IN IP4 192.168.117.9 t=0 0 m=audio 23302 RTP/AVP 8 0 101 13 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=ptime:20 ------------------------------------------------------------------------ recv 364 bytes from udp/[192.168.117.8]:51358 at 08:06:51.041020: ------------------------------------------------------------------------ ACK sip:mod_sofia@192.168.117.9:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.117.8:5060;branch=z9hG4bK731155 From: <sip:xxxxxxxxxxxx@192.168.117.8>;tag=21811124-711 To: <sip:100965461@192.168.117.9>;tag=vUg243Ng67UHD Date: Fri, 14 Sep 2012 08:07:14 GMT Call-ID: 6DE7A86-FD7A11E1-859AE929-E0E81CE1@192.168.117.8 Max-Forwards: 70 CSeq: 101 ACK Content-Length: 0 ------------------------------------------------------------------------ send 645 bytes to udp/[192.168.117.8]:5060 at 08:06:51.041020: ------------------------------------------------------------------------ BYE sip:xxxxxxxxxxxx@192.168.117.8:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.117.9;rport;branch=z9hG4bKvBN2ZB9DZKZ6c Max-Forwards: 70 From: <sip:100965461@192.168.117.9>;tag=vUg243Ng67UHD To: <sip:xxxxxxxxxxxx@192.168.117.8>;tag=21811124-711 Call-ID: 6DE7A86-FD7A11E1-859AE929-E0E81CE1@192.168.117.8 CSeq: 33468941 BYE Contact: <sip:mod_sofia@192.168.117.9:5060> User-Agent: FreeSWITCH-mod_sofia/1.3.0+git~20120907T231757Z~c2893801cb Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY Supported: timer, precondition, path, replaces Reason: SIP;cause=488;text="No answer to offer" Content-Length: 0 ------------------------------------------------------------------------ recv 426 bytes from udp/[192.168.117.8]:51358 at 08:06:51.042020: ------------------------------------------------------------------------ BYE sip:mod_sofia@192.168.117.9:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.117.8:5060;branch=z9hG4bK741AD7 From: <sip:xxxxxxxxxxxx@192.168.117.8>;tag=21811124-711 To: <sip:100965461@192.168.117.9>;tag=vUg243Ng67UHD Date: Fri, 14 Sep 2012 08:07:14 GMT Call-ID: 6DE7A86-FD7A11E1-859AE929-E0E81CE1@192.168.117.8 User-Agent: Cisco-SIPGateway/IOS-12.x Max-Forwards: 70 Timestamp: 1347610034 CSeq: 102 BYE Content-Length: 0 ------------------------------------------------------------------------ send 387 bytes to udp/[192.168.117.8]:5060 at 08:06:51.042020: ------------------------------------------------------------------------ SIP/2.0 100 Trying Via: SIP/2.0/UDP 192.168.117.8:5060;branch=z9hG4bK741AD7 From: <sip:xxxxxxxxxxxx@192.168.117.8>;tag=21811124-711 To: <sip:100965461@192.168.117.9>;tag=vUg243Ng67UHD Call-ID: 6DE7A86-FD7A11E1-859AE929-E0E81CE1@192.168.117.8 CSeq: 102 BYE Timestamp: 1347610034 0.000000 User-Agent: FreeSWITCH-mod_sofia/1.3.0+git~20120907T231757Z~c2893801cb Content-Length: 0 ------------------------------------------------------------------------ send 510 bytes to udp/[192.168.117.8]:5060 at 08:06:51.043021: ------------------------------------------------------------------------ SIP/2.0 480 Temporarily Unavailable Via: SIP/2.0/UDP 192.168.117.8:5060;branch=z9hG4bK741AD7 From: <sip:xxxxxxxxxxxx@192.168.117.8>;tag=21811124-711 To: <sip:100965461@192.168.117.9>;tag=vUg243Ng67UHD Call-ID: 6DE7A86-FD7A11E1-859AE929-E0E81CE1@192.168.117.8 CSeq: 102 BYE User-Agent: FreeSWITCH-mod_sofia/1.3.0+git~20120907T231757Z~c2893801cb Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY Supported: timer, precondition, path, replaces Content-Length: 0 ------------------------------------------------------------------------ recv 363 bytes from udp/[192.168.117.8]:5060 at 08:06:51.046021: ------------------------------------------------------------------------ SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.117.9;rport;branch=z9hG4bKvBN2ZB9DZKZ6c From: <sip:100965461@192.168.117.9>;tag=vUg243Ng67UHD To: <sip:xxxxxxxxxxxx@192.168.117.8>;tag=21811124-711 Date: Fri, 14 Sep 2012 08:07:14 GMT Call-ID: 6DE7A86-FD7A11E1-859AE929-E0E81CE1@192.168.117.8 Server: Cisco-SIPGateway/IOS-12.x Content-Length: 0 CSeq: 33468941 BYE ------------------------------------------------------------------------ Thanks, Denis