Tandberg 880s & Cisco Routers

Posted on 2005-04-09
Last Modified: 2012-05-05
We have two Tandberg 880s, one in Ohio and one in Arkansas.  The one in Ohio is behind a Cisco 1600 router and the one in Arkansas is behind a Cisco 1841 router.  I have a static NAT setup on the respective routers for both systems.  After working with tech support (for hours), it seems that both systems can call out, but they cannot receive calls.  Tech support said I need to open up the following list of ports for both incoming and outgoing traffic.

udp 1719
tcp 1720
udp 2326 - 2373
tcp 5555 - 5565

Aside from the static NAT (ip nat inside source static <inside address> <outside address>), what else do I need to do?  There should be no access lists that are blocking that traffic (ip permit any any).  Do I need to use an access list or use a static port forwarding?  I really need to have this resolved ASAP so any help is appreciated.  Thanks.

Question by:bruno71
    LVL 12

    Assisted Solution

    Well..The support guys are crrect..You need to open up the mentioned ports are used by CISCO for call manager setup and h323....
    I recommend to create a acceslist which specifically allows the above ports or atleast drops the unwatned traffic...

    Reg port forwarding i guess mostly not required..But depending on the port selection criteris I may not give the right answer...Plz try the setup n then if you have any problems we can discuss it here...
    LVL 1

    Expert Comment

    Do you have
    fixup protocol h323
     in your config?  If so, remove it.  (for 500 pts, hopefully you know how to do that.)

    You're lucky your Cisco isn't crashing and rebooting - see ,  a bug that I reported (cco login required).
    LVL 8

    Assisted Solution

    Most likely there is also a setting on the Tanberg where you configure it to use the 'translated' address when connecting, and whether your firewall is h.323 friendly.

    I have the Polycom stuff which is pretty similar, and I have to uncheck h.323 friendly in order for it to accept calls.  
    LVL 1

    Expert Comment

    Bruno71, are you still there?  What's the configuration of your ciscos?  Tandbergs? (e.g. IPs, h.323, including advanced config)

    no fixup protocol h323
    resolve the problem?

    Author Comment

    The issue was already fixed by Tandberg tech support.  They directly gave the unit a public IP address instead of NATing through the router.  This question can be closed.  Sorry I forgot about it.

    LVL 1

    Accepted Solution

    Prolly for the best.  Cisco doesn't support videoconferencing well, espcially with NAT, and since you had the spare IP, that's a good, simple solution.

     Since and I others did provide solutions, even if you chose a different one, please close the question and assign points. (I have used my solution myself, so I know it works.)

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