The answer for your question is dependent upon your current Unity server. If it is a stand alone server, it is already a Primary. After obtaining the proper licensing, you simply need to install the secondary server as a stand alone server, ensure ...
CallManager integrates with SIP using a SIP trunk to the Proxy server irrepective of the Proxy vendor. CallManager sends and receives SIP messages through the trunk connection. Adapters, such as the ATA running SIP firmware may connect to CM through...