Unified Voicemail is the combination of different voicemail bearers into a single voicemail system. Using dedicated DID /DDI numbers for each mailbox, the mailbox can be used on a variety of devices and end-points. This is similar to what GSM providers use for their voicemail systems. Mobile phones and traditional analog phones need to support conditional call diversion to enjoy unified voicemail. Unified Voicemail can be extended into traditional unified messaging.
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Unified voicemails have emerged in importance in the last decade or so when consumers have adopted multiple platforms for their communication needs. An average consumer may answer to as many as four or five phone numbers, a traditional phone line at home, in the office, a mobile phone and a SIP number for his/her computer. With unified voicemail users can have one voice mail for all these disparate lines. They need to access a single mailbox, regardless whether the message has been left on their desk, mobile or VoIP phone.