Cisco ip phone will only work when its connected to a cisco communication manager AVVID , then it can be connected to an ip office note you will require VCM for the voip connectivity.
A Cisco ATA will work fine on the IPO if:
- you put the H.323 firmware on the ATA
- buy 3th party terminal licenses for the IPO
- you don't try to use it for faxing
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