Hi You can install using CCM Express on 2821 & register your ATA 188 with it is will give the same functionlity what you can get with ccm & definetly another ways is using H323 firmware image in ATA 188 and install gatekeeper on 2821 that also will w...

Hi, I think if you can install multiple Virtual PC on either VMWARE or Microsoft Virtual PC then you can run multiple instance of IP communicator from same PC Revert me if you have any problem