[jitsi-users] Jitsi ACK issue


#1

Dear All,

For my telephony, I am using FreePBX. However, I would like to depend less on
telecommunications providers and move more towards federation. Thus, I
implemented a resiprocate gateway much as described here:
http://www.rtcquickstart.org/sip-proxy-installation/repro

The only modification to the setup at http://www.opentelecoms.org
is, that I would like to keep internal phones registered with the FreePBX server
for the time being rather than with the gateway. For a start, I would like to be
reachable via SIP-tls (i.e. call to e-mail address) and have calls forwarded from
the WAN via the repro-proxy gateway to FreePBX and ultimately to local phones.

However, when connecting jitsi clients to the gateway, registration works, but
calls do not go through. The correct phone does ring, but upon pickup, the jitsi
client signals: "Failed to create ACK request!". The asterisk log in FreePBX does
look normal, just as if someone did call but did hang up right after pickup. The
repro messages in the syslog on the gateway server also look OK as far as I can
tell. However, they are difficult to interpret in detail, as medium log levels do
not reveal much while higher log levels create overwhelming amounts of hard to
interpret output.

The same happens if I try to place a call between two jitsi clients which are
both connected to the resiprocate gateway. If I connect the clients from the WAN
instead of the LAN, a pfSense router running snort comes into play. Then the
jitsi client LAN frequently gets blocked based on the "Empty request URI"
preprocessor rule of snort. That should not happen of course, but I do not know
how to fix it. If I connect the jitsi clients straight to the FreePBX server,
however, everything works completely without issues both on the LAN and via VPN.

I would very much welcome if someone could point me to the right direction in
order to cure this.

I do have both jitsi log files. They do contain statements like:

18:42:23.595 Schwerwiegend: [94847] impl.protocol.sip.SipLogger.logError().122
Error from the JAIN-SIP stack: ACK Was not sent. killing dialog 18:42:34.820
Schwerwiegend: [94847] impl.protocol.sip.SipLogger.logError().122 Error from the
JAIN-SIP stack: ACK Was not sent. killing dialog
18:42:42.821 Schwerwiegend: [94847]
impl.protocol.sip.SipStackSharing.processDialogTerminated().525 Dialog wasn't
marked, please report this to dev@sip-communicator.dev.java.net

If it helps, I would be glad to supply the pcap-file and the full log file, but I
would prefer to mail the full files for privacy reasons.

Regards,

Michael Schefczyk