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The corporate IP telephony-based voice-mail CPEmarket is served by several vendors including Avaya, Cisco systems, Adomo, Interactive Intelligence, Nortel, Mitel, 3Com, and AVST.

Their marketing strategy will have to address the need to support a variety of legacy PBXs as well as new Voice over IP as enterprises migrate towards converging IP-based telecommunications.

A similar situation exists for the carrier market for voice-mail servers, currently dominated by Comverse Technology, with some share still held by Lucent Technologies.