Dial format from tandberg C20 to Polycom

Unanswered Question
May 15th, 2012


I have a question about the dial format to call from a Cisco/Tandberg C20 to a Polycom H323 device.

I tryied to call using the following formats:





The didn't work at any time. I'm not sure if the format is correct.


I have this problem too.
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Magnus Ohm Tue, 05/15/2012 - 22:20


Did you try setting the C20 call setup mode to direct and only call the public ip of the polycom unit?


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Jens Didriksen Tue, 05/15/2012 - 22:51

In addition to Magnus' comment; if your C-system has an earlier firmware version than TC4.2, then it cannot do URI dialling unless it's registered to a GK, VCS etc as h.323cs was not supported in earlier software releases.

Also note the PLCM system has to be registered to a GK or similar to be able to receive URI type of calls.

Older PLCM systems also does not support Annex O URI dialling, which is the standard, and this is the only type of URI dialling which is supported by C-series.

Annex O: Alias@domain or you can also use Alias@GK_IP_address.

IP_address##Alias is PLCM proprietary "URI dialling" and will not work from a C-series.

You can, if you're using a VCS-C/VCS-E set-up, allow PLCM systems to call you using IP_address##Alias by doing a presearch transform on the VCS-E which transforms this address to Annex O type address.



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