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 Developer
http://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
<http://111.111.8.146:28733> -> 192.168.0.113:5060
<http://192.168.0.113:5060> [AP]
SUBSCRIBE sip:[email protected]
<mailto:sip%[email protected]> 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: [email protected]
<mailto:[email protected]>.
CSeq: 303 SUBSCRIBE.
Contact: <sip:[email protected]
<mailto:sip%[email protected]>;gr=urn:uuid:683f87a0-e026-5f0a-b86b-58139361c7a4>.
From: <sip:[email protected]
<mailto:sip%[email protected]>>;tag=359dbb1cb104d434.
To: <sip:[email protected] <mailto:sip%[email protected]>>.
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:[email protected]
<mailto:sip%[email protected]>>.
X-TAATag: 6ed63f01-3191-4a1f-b2a2-4121fb834f07.
Content-Length: 0.
.
T 2015/02/10 12:52:09.326218 192.168.0.113:5060
<http://192.168.0.113:5060> -> 111.111.8.146:28733
<http://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: [email protected]
<mailto:[email protected]>.
CSeq: 303 SUBSCRIBE.
From: <sip:[email protected]
<mailto:sip%[email protected]>>;tag=359dbb1cb104d434.
To: <sip:[email protected]
<mailto:sip%[email protected]>>;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:[email protected]:5060;transport=tcp>.
Server: Test.
Content-Length: 0.
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