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2023
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Acevirgil de Ocampo
Rising star

H323 endpoint dialing SIP format

Hi,

I am experiencing this kind of issue:


If endpoint-1 with public IP 122.x.x.x will dial "411@company.com" using H323 it was successful.


If endpoint-2 is behind firewall will dial "411@company.com" using H323 call will fail

On the endpoint the message says "unable to setup encrypted call, turn off encryption"


Same settings wasconfigured on endpoint-1 and endpoint-2. The only difference is the network parameters, endpoint-1 on public while endpoint-2 on private behind firewall.


I think this is a firewall issue, what should we check on the firewall for a H323 endpoint to dial the " 411@company.com" address format?


Thank you for help..


Br,


Acevirgil

3 REPLIES 3
Jens Didriksen
Collaborator

Firstly, the address is not SIP format per see, it is H.323 Annex O URI format, but yes, SIP URIs look the same as well.

What kind of end-points are these, and which software version do they run?

What jumps out at me is this "endpoint-2 on private behind firewall" - so, NAT'ed with other words - in which case you would have to set up a public address and use a static route between the private and the public address, or register the system with a VCS-E or something similar. Remember, the private address is not routable on the internet.

/jens

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Hi Jens,

Thank you for your response.

The endpoint-2 is NAT'ed. Could you provide list of specific firewall ports needed to make it work?

Thank you for help.

Br,

Acevirgil

Well, then it either needs to register with something like a VCS-E, or the end-point you are calling needs to be behind a VCS-E/VCS-S type of set-up and your endpoint needs to be H.460.18/19 compliant.

If none of that applies, then you need to give it a public address and do that static route between the private and the public address, or if applicable use the NAT settings in the end-point.

Since you haven't said what kind of end-point this is, this gives you ports for MXPs and C-series;

https://supportforums.cisco.com/thread/2154000

There's also this doc:

https://supportforums.cisco.com/docs/DOC-18565

This Whitepaper might also be of interest;

http://www.cisco.com/en/US/docs/telepresence/endpoint/mxp-series/white_papers/tandberg_h323.pdf

/jens

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