[Serusers] invites timeout after period of time

[Klaus Darilion]

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 at 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 at 64.72.107.2>..To: <sip:713315469
> 3 at 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 at 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 at 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 at 64.72.107.2>..To:
> <sip:7133154693 at 64.72.107.4;user=phone;   phone-context=national>..Call-ID:
> B67CA151-ACDA11D8-A5E08B34   -F8DB44FC at 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 at 64.72.107.4;user=phone;phone-context=national
> out_uri=   sip:7133154693 at 64.72.107.1:55246 via_cnt==1"....
> #
> U 64.72.107.4:5060 -> 64.72.107.1:55246
> INVITE sip:7133154693 at 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 at 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 at 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 at 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 at 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 at 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 at 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 at 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 at 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 at 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 at 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 at 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 at cytelcom.com
> Ph. 281-449-4000 x3098
> 
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