The Cisco DPA-7610 of voice mail gateways is a family of Voice over IP (VoIP) gateways that enables legacy voicemail equipment to connect to a Cisco IP telephony solution network. The Cisco DPA-7610 allows Octel voice mail systems, which currently use Digital Station Emulation to connect to an Avaya Definity PBX, or a Nortel Meridian 1 PBX, to instead connect to a Cisco CallManager system without any changes to the voice mail system. The Cisco DPA-7610 allows the voice mail system to be used solely by the Cisco CallManager or to be shared between the Cisco CallManager and the private branch exchange (PBX).