1 Jul
2010
1 Jul
'10
3:38 p.m.
Hi, I have a similar issue, my proxy sip doesn't relay the ACK coming from a
Cisco GW (caller), to a PSTN-GW (callee), then the OK and ACK are retransmitted
for a while till the pstn-gw send a BYE.
Attach a text graph, where:
10.10.10.128 is a Cisco GW.
10.15.15.122 is my Proxy SIP (and oldie SER one)
10.20.20.153 is the PSTN-GW.
It only happens with this cisco gw, works great with asterisk and others ata.
I think there is something wrong with the ACK, i don't understand why the the
proxy sip ignores it and never relays it.
I'd appreciate any comment. I also can help to solve the original issue of Ole
K.
Regards,
Caio
On Thu, 1 Jul 2010, Klaus Darilion wrote:
Hi!
Kamailio behaves correct in this trace and I couldn't spot an abvious error in
the trace.
Nevertheless there are 2 problems:
1. Asterisk Gateway does not receive/accept the ACK
2. Asterisk PBX does not retransmit ACK
reg. 1: ask the gateway operator if he sees the ACK in the Asterisk log, and
if yes the error message of Asterisk why this ACK is not accepted. If the ACK
is not seen in the Asterisk console then maybe it gets dropped by a buggy
firewall.
reg 2: login to your Asterisk PBX and verify if Asterisk receives the 200 OK,
and maybe spot some log message why it does not trigger ACK retransmissions.
regards
Klaus
Am 30.06.2010 23:33, schrieb Ole Kaas:
Den 30/06/2010 kl. 01.23 skrev Iñaki Baz Castillo:
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2010/6/29 Ole Kaas<obk(a)tet.dk>dk>:
You are right. But maybe it was something (obvious) that could be resolved
quickly and I could post an update here on the list. The original log was
inadequate - Klaus was a great help, with suggestions to obtain new log. So
here it is attached and anonymized with all ip addresses (and stuff)
converted to private adresses. The Kamailio server is multi homed and the
two networks are non-routable (I use rtpproxy to bridge media). Our Asterisk
PBX is version 1.4.26.1 and the Asterisk Gateway is 1.6.1 (or 1.6.0 - cant
remember and not under my control). Kamailio is version 3.0.0.
Looking at the trace, it seems the problem starts with the ACK not being
received by the Asterisk Gateway which then resends the OK. The OK is
relayed back to the originating Asterisk PBX which seems to ignore the
retransmission. In fact it seems that Kamailio is routing and relaying the
sip packets correctly. However, it seems that the problem only exists
between Asterisk and Kamailio. I have other pbx'es (3CX) connecting to
Kamailio and I have no evidence that the problem happens with those. I have
another trace where the call comes from one of the Asterisk Gateways and is
routed back to one of the other Asterisk Gateways. The result is the same -
the OK's are ignored by Asterisk.
/Ole
Hi Klaus,
I've mailed pcap dump to you directly for further inspection.
Hi, it's much better if you capture a trace with "ngrep -Wbyline -t -q
port 5060" and paste it in a new mail by replacing your public IP's
with other values. Then all the people here could help you rather than
asking for private help to a specific member of the maillist.