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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