Obviously the mapping in your NAT box expires and the SIP proxy can not reach the UE behind the NAT. The solution is to periodically send messages to keep the NAT binding alive. These can be done in the UE (xlite: Advanced System Settings - SIP Settings - send UDP keep alive..) or in the SIP proxy. Usually nathelper "pings" (= UDP packet with "<CR><LF>" as payload) the natted clients to keep the bindings alive. Watch for those "UDP-pings" in ethereal and look at the README of nathelper.
regards, Klaus
Harold Workman wrote:
hi,
When I load X-Lite behind a Single Mapped Port Symmetric NAT Firewall and make a call to it, the X-Lite rings and I can hear voice in both directions. The problem is when I leave the X-Lite sitting idle for over 1 minute, the inbound calls to client start to time out. Outbound calls from client work no problem. Im not receiving anything on the X-Lite debugs, and when i debug the SER, I see repeatedly sending Invites with no response. Below is the debug...64.72.107.2 is my Gateway, .4 is my SER, and .1 is my firewall NAT address where my client X-Lite sits behind. If i close the X-Lite and open it back up, I am able to make calls to it again until I leave it sit idle...Any ideas? Could something be wrong with my nathelper?
Failed Attempt...
U 64.72.107.2:55580 -> 64.72.107.4:5060 INVITE sip:7133154693@64.72.107.4;user=phone;phone-context=n ational SIP/2.0..Via: SIP/2.0/UDP 64.72.107.2:5060..From: " 2814497314" sip:2814497314@64.72.107.2..To: sip:713315469 3@64.72.107.4;user=phone;phone-context=national..Date: Mon, 24 May 2004 17:00:37 GMT..Call-ID: B67CA151-ACDA11D8-A5E08B 34-F8DB44FC@64.72.107.2..Cisco-Guid: 3061621073-2899972568-2 782825268-4175119612..User-Agent: Cisco VoIP Gateway/ IOS 12 .x/ SIP enabled..CSeq: 101 INVITE..Max-Forwards: 6..Timestam p: 1085418037..Contact: sip:2814497314@64.72.107.2:5060;use r=phone..Expires: 180..Content-Type: application/sdp..Conte nt-Length: 132....v=0..o=CiscoSystemsSIP-GW-UserAgent 6230 2 341 IN IP4 64.72.107.2..s=SIP Call..c=IN IP4 64.72.107.2..t= 0 0..m=audio 20478 RTP/AVP 8.. # U 64.72.107.4:5060 -> 64.72.107.2:5060 SIP/2.0 100 trying -- your call is important to us..Via: SIP /2.0/UDP 64.72.107.2:5060..From: "2814497314" <sip:28144973 14@64.72.107.2>..To: <sip:7133154693@64.72.107.4;user=phone; phone-context=national>..Call-ID: B67CA151-ACDA11D8-A5E08B34 -F8DB44FC@64.72.107.2..CSeq: 101 INVITE..Server: Sip EXpress router (0.8.12-tcp_nonb (i386/linux))..Content-Length: 0..W arning: 392 64.72.107.4:5060 "Noisy feedback tells: pid=159 6 req_src_ip=64.72.107.2 req_src_port=55580 in_uri=sip:71331 54693@64.72.107.4;user=phone;phone-context=national out_uri= sip:7133154693@64.72.107.1:55246 via_cnt==1".... # U 64.72.107.4:5060 -> 64.72.107.1:55246 INVITE sip:7133154693@64.72.107.1:55246 SIP/2.0..Via: SIP/2. 0/UDP 64.72.107.4;branch=z9hG4bKeb02.9f521926.0..Via: SIP/2. 0/UDP 64.72.107.2:5060..From: "2814497314" <sip:2814497314@ 64.72.107.2>..To: <sip:7133154693@64.72.107.4;user=phone;pho ne-context=national>..Date: Mon, 24 May 2004 17:00:37 GMT..C all-ID: B67CA151-ACDA11D8-A5E08B34-F8DB44FC@64.72.107.2..Cis co-Guid: 3061621073-2899972568-2782825268-4175119612..User-A gent: Cisco VoIP Gateway/ IOS 12.x/ SIP enabled..CSeq: 101 I NVITE..Max-Forwards: 5..Timestamp: 1085418037..Contact: <sip :2814497314@64.72.107.2:5060;user=phone>..Expires: 180..Cont ent-Type: application/sdp..Content-Length: 132..P-hint: USRL OC....v=0..o=CiscoSystemsSIP-GW-UserAgent 6230 2341 IN IP4 6 4.72.107.2..s=SIP Call..c=IN IP4 64.72.107.2..t=0 0..m=audio 20478 RTP/AVP 8.. # U 64.72.107.4:5060 -> 64.72.107.1:55246 INVITE sip:7133154693@64.72.107.1:55246 SIP/2.0..Via: SIP/2. 0/UDP 64.72.107.4;branch=z9hG4bKeb02.9f521926.0..Via: SIP/2. 0/UDP 64.72.107.2:5060..From: "2814497314" <sip:2814497314@ 64.72.107.2>..To: <sip:7133154693@64.72.107.4;user=phone;pho ne-context=national>..Date: Mon, 24 May 2004 17:00:37 GMT..C all-ID: B67CA151-ACDA11D8-A5E08B34-F8DB44FC@64.72.107.2..Cis co-Guid: 3061621073-2899972568-2782825268-4175119612..User-A gent: Cisco VoIP Gateway/ IOS 12.x/ SIP enabled..CSeq: 101 I NVITE..Max-Forwards: 5..Timestamp: 1085418037..Contact: <sip :2814497314@64.72.107.2:5060;user=phone>..Expires: 180..Cont ent-Type: application/sdp..Content-Length: 132..P-hint: USRL OC....v=0..o=CiscoSystemsSIP-GW-UserAgent 6230 2341 IN IP4 6 4.72.107.2..s=SIP Call..c=IN IP4 64.72.107.2..t=0 0..m=audio 20478 RTP/AVP 8.. # U 64.72.107.4:5060 -> 64.72.107.1:55246 INVITE sip:7133154693@64.72.107.1:55246 SIP/2.0..Via: SIP/2. 0/UDP 64.72.107.4;branch=z9hG4bKeb02.9f521926.0..Via: SIP/2. 0/UDP 64.72.107.2:5060..From: "2814497314" <sip:2814497314@ 64.72.107.2>..To: <sip:7133154693@64.72.107.4;user=phone;pho ne-context=national>..Date: Mon, 24 May 2004 17:00:37 GMT..C all-ID: B67CA151-ACDA11D8-A5E08B34-F8DB44FC@64.72.107.2..Cis co-Guid: 3061621073-2899972568-2782825268-4175119612..User-A gent: Cisco VoIP Gateway/ IOS 12.x/ SIP enabled..CSeq: 101 I NVITE..Max-Forwards: 5..Timestamp: 1085418037..Contact: <sip :2814497314@64.72.107.2:5060;user=phone>..Expires: 180..Cont ent-Type: application/sdp..Content-Length: 132..P-hint: USRL OC....v=0..o=CiscoSystemsSIP-GW-UserAgent 6230 2341 IN IP4 6 4.72.107.2..s=SIP Call..c=IN IP4 64.72.107.2..t=0 0..m=audio 20478 RTP/AVP 8..
Harold Workman CCNA, CCNP Cytel Communications hworkman@cytelcom.com Ph. 281-449-4000 x3098
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