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?


Sent from Cisco Technical Support iPhone App

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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Posted May 15, 2012 at 8:47 PM
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