TC6 Firmware - call disconnects after 2 hours

Hi all

Our client complains that after the firmware update on the endpoints of telepresence (C40, C60, EX90) to TC6.x, there are two questions:

1 end with TC6.x points will disconnect after 120 minutes to be connected to any appeal initiated by the remote end.  They will not cut the minute 120 if the TC6.x Unit has initialized the call.

2 end points with TC6.x cannot connect to units MXP running F6 or earlier.  Since we MXP Codec Software F6 and F5 this is causing problems with the calls point to point.

They have units with the TC5.1.6 software which have no problem at all. The only thing among others as the routers and switches is a VCS controller.

Anyone has any ideas on what is the cause?

Thank you

John

In TC6, we turned silently on TCP KeepAlive for the session h225 running with the default time of linux tcp_keepalive_time of 7200 seconds.  That would probably explain the disconnection to 120 minutes which sees the John after moving from TC5.1.6.

I would also say that if this is the case, there is something which is tcp to the current between the two devices.  The firewall is also my first thought.  Perhaps WAAS on a router?  Sometimes you can get a clue that this is occurring by comparing the tcp ack/seq/windowsize header to see if it is different between the sending to the receiving side for the same package.  Something like 'tcpdump-s0 w /tmp/h225.pcap port 1720' root must limit the collected output.

The TC6 troubleshooting located here would be a good reference in newspapers and tcpdump to use for troubleshooting signaling related issues:

http://www.Cisco.com/en/us/docs/Telepresence/endpoint/codec-c-series/TC6/troubleshooting_guide/tc_troubleshooting_guide_tc60.PDF

The example uses this doc does not filter the traffic and John you do not want to limit the output of tcpdump only for signalling interesting to avoid problems with the size of the OCAP collected file.

We have a bug open better control KeepAlive on the session h225 (CSCub20591) but not clear if/when it will be executed and for now if there is something that is expire tcp sessions in the network, changes will be made here to avoid this problem.

For the 2nd question, I'm not aware either a problem with older MXP but your approach Martin to try a later version of the software would also be what I would recommend.  If you need to solve problems with old software MXP TC6, the same troubleshooting guide h323 newspapers are where you want to focus on to see where in the handshake the call fails and compare this output between TC6 and TC5.1.6 as to what has changed that can have an impact on this.

Tags: Cisco Support

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