[OpenSIPS-Users] Presence over TCP with NAT, possible bug

[Pete Kelly]

Bogdan

In fact the TCP connection stays open (I checked with netstat on port 28733
being open on the remote host).

I think the problem is opensips is opening (or is supposed to open) 5060 on
the remote and this is failing? I think it may be looking for an already
existing connection to 5060?

Pete

On 11 February 2015 at 20:11, Bogdan-Andrei Iancu <bogdan at opensips.org>
wrote:

>  Hi Pete,
>
> If the TCP connection (the one used to received the SUBSCRIBE from end
> user) went down, when sending an in-dialog NOTIFY, OpenSIPS will refuse to
> open a new TCP connection (the policy is to accept connection, not to open
> connections towards end-users).
>
> Can you check if this is your case ?
>
> Regards,
>
> Bogdan-Andrei Iancu
> OpenSIPS Founder and Developerhttp://www.opensips-solutions.com
>
> On 11.02.2015 12:50, Pete Kelly wrote:
>
>  I have been experimenting recently with Presence over TCP and noticed
> sometimes OpenSIPS fails to send a NOTIFY for a recent SUBSCRIBE, with a
> tcp_send error in the logs.
>
>  I did some research and found an old issue which seems to be similar to
> this as the inbound SUBSCRIBE TCP connection is on a high port, yet the
> NOTIFY is to go to port 5060.
>
>  http://lists.opensips.org/pipermail/users/2013-May/025922.html
>
>  The fix here is to set tcp_accept_aliases =1
>
>  I tried this fix and it did not resolve the issue. Looking in the source
> code it seems OpenSIPS may be trying to reuse an old/existing TCP
> connection and is failing to find one - it does seem to be slightly
> intermittent too. Sometimes (very rarely) it will work, and it seems to be
> related to how many other TCP connections are open at the moment but I have
> found it very very difficult to pin down. In the end I got round it by
> looping the TCP SUBSCRIBE back to UDP and the OpenSIPS then produces a
> NOTIFY/UDP no problem. This solution is a bodge and I would be interested
> to know if the failure to tcp_send is a bug or something I can detect and
> handle in the config somehow?
>
>  Using OpenSIPS 1.11 latest, in EXTRA_DEBUG mode this is the error that
> is produced:
>
>  [19361]: ERROR:tm:msg_send: tcp_send failed
> [19361]: ERROR:tm:t_uac: attempt to send to 'sip:111.111.8.146:5060;transport=tcp;lr'
> failed
>
>  This is the inbound SUBSCRIBE and 200OK... I am simply dealing with this
> by calling handle_subscribe('1');
>
>  T 2015/02/10 12:52:09.324134 111.111.8.146:28733 -> 192.168.0.113:5060
> [AP]
> SUBSCRIBE sip:user203 at test-domain.com SIP/2.0.
> Via: SIP/2.0/TCP 111.111.8.146:5060
> ;egress-zone=DNS;branch=z9hG4bK5c628151ab895c5f2f45ed8bdafeda0d24504147.1569b0b8efc74f7daf3767cc97d0b38e;proxy-call-id=345dee99-7aca-44b4-bf5f-fb1f2e57774a;rport.
> Via: SIP/2.0/TLS 10.15.20.113:54999
> ;branch=z9hG4bKfd5e7b1424014fc8de23205f0de3873e.1;received=188.39.51.2;rport=54999;ingress-zone=DefaultSubZone.
> Call-ID: a1922a193e1b6057 at 10.15.20.113.
> CSeq: 303 SUBSCRIBE.
> Contact: <sip:pkelly at test-domain-2.com
> ;gr=urn:uuid:683f87a0-e026-5f0a-b86b-58139361c7a4>.
> From: <sip:pkelly at test-domain-2.com>;tag=359dbb1cb104d434.
> To: <sip:user203 at test-domain.com>.
> Max-Forwards: 15.
> Record-Route: <sip:111.111.8.146:5060;transport=tcp;lr>.
> Record-Route: <sip:111.111.8.146:5061;transport=tls;lr>.
> Record-Route: <sip:188.39.51.2:54999
> ;transport=tls;apparent=remove;ds;lr;proxy-call-id=345dee99-7aca-44b4-bf5f-fb1f2e57774a>.
> User-Agent: Test.
> Expires: 3600.
> Event: presence.
> Accept: application/pidf+xml.
> P-Asserted-Identity: <sip:pkelly at test-domain-2.com>.
> X-TAATag: 6ed63f01-3191-4a1f-b2a2-4121fb834f07.
> Content-Length: 0.
> .
>
>
>  T 2015/02/10 12:52:09.326218 192.168.0.113:5060 -> 111.111.8.146:28733
> [AP]
> SIP/2.0 200 OK.
> Via: SIP/2.0/TCP 111.111.8.146:5060
> ;received=111.111.8.146;egress-zone=DNS;branch=z9hG4bK5c628151ab895c5f2f45ed8bdafeda0d24504147.1569b0b8efc74f7daf3767cc97d0b38e;proxy-call-id=345dee99-7aca-44b4-bf5f-fb1f2e57774a;rport=28733.
> Via: SIP/2.0/TLS 10.15.20.113:54999
> ;branch=z9hG4bKfd5e7b1424014fc8de23205f0de3873e.1;received=188.39.51.2;rport=54999;ingress-zone=DefaultSubZone.
> Call-ID: a1922a193e1b6057 at 10.15.20.113.
> CSeq: 303 SUBSCRIBE.
> From: <sip:pkelly at test-domain-2.com>;tag=359dbb1cb104d434.
> To: <sip:user203 at test-domain.com
> >;tag=e3eb1f19b04f8e78afd28f643f416b5f-9be8.
> Record-Route: <sip:111.111.8.146:5060;transport=tcp;lr>.
> Record-Route: <sip:111.111.8.146:5061;transport=tls;lr>.
> Record-Route: <sip:188.39.51.2:54999
> ;transport=tls;apparent=remove;ds;lr;proxy-call-id=345dee99-7aca-44b4-bf5f-fb1f2e57774a>.
> Expires: 3600.
> Contact: <sip:sa at 222.222.200.79:5060;transport=tcp>
> <sip:sa at 222.222.200.79:5060;transport=tcp>.
> Server: Test.
> Content-Length: 0.
>
>
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