When Unified Messaging records the audio for a voice message, it uses ASR to create voice mail preview text from the audio file, and then submits the whole voice message for delivery to the user. For each voice message that's created, Unified Messaging determines a confidence level for the voice mail preview included with the message. It measures how well the sounds in the recording match the words, numbers, and phrases in the message. If the system finds matches easily, the confidence level will be high. A higher level of confidence is generally associated with a higher accuracy.

The accuracy of voice mail preview text depends on many factors, and sometimes those factors can't be controlled. However, the text is likely to be more accurate when:

• A simple voice message is left, and the caller doesn't use slang terms, technical jargon, or unusual words or phrases.
  
  
• The caller uses a language that's easily recognized and translated by the voice mail system. Generally, voice messages left by callers who don't speak too quickly or too softly and who don't have strong accents will produce more accurate sentences and phrases.
  
  
• The voice message is free of background noise and echoes, and the audio doesn't drop out.
  
  

Most customers who use Unified Messaging find that the voice mail previews are accurate enough for their users. However, when ASR is applied to recordings made over the phone by unknown voices and background noises, the voice mail preview text usually isn't completely accurate. If the level of confidence is consistently low or the voice mail previews that are received aren't very accurate, you can increase the accuracy of the voice mail previews that users receive as follows:

• Sign up for a voice transcription service from a Voice Mail Preview partner.
  
  
• After you've signed up with a Voice Mail Preview partner, set the partner up to work with UM. For more information about how to configure UM for a Voice Mail Preview partner, see Configure Voice Mail Preview Partner Services for Users.
  
  

When you've signed up with a Voice Mail Preview partner, the Exchange servers in your organization redirect voice messages with the audio file attached to the Voice Mail Preview partner instead of generating voice mail preview text for voice messages and submitting the voice messages to the user’s mailbox. The email message with the voice mail preview text produced by the Voice Mail Preview partner is then submitted to the Exchange servers in your organization for delivery to the recipient's mailbox.

Important:

We recommend that all customers who plan to deploy Unified Messaging obtain the assistance of a UM specialist. A UM specialist helps you ensure that there's a smooth transition to UM from a legacy voice mail system. Performing a new deployment or upgrading a legacy voice mail system requires significant knowledge about VoIP gateways, IP PBXs, PBXs, session border controllers (SBCs), and Unified Messaging. For more information about how to contact a UM specialist, see the Microsoft Exchange Server 2013 Unified Messaging (UM) Specialists or Microsoft Pinpoint for Unified Messaging.

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To become certified as a Voice Mail Preview partner that interoperates with Exchange UM, the partner must implement the requirements contained in the Voice Mail Preview Interoperability Specification, and the partner solution must be certified by an independent certification vendor. If you're interested in certifying your transcription service to work with Exchange UM, submit a request to Voice Mail Preview Partners for Exchange Unified Messaging.

If you've already deployed Unified Messaging in your organization and you're looking for a certified Voice Mail Preview partner to provide transcription support services, see Microsoft PinPoint. These software vendors have been certified as interoperable with Exchange UM.

After UM has been configured, it forwards voice messages with the audio to a dedicated Voice Mail Preview partner, which then takes the audio file and creates the voice mail preview text. However, to allow users to receive the voice mail preview with their voice message in their mailbox, you must configure a UM mailbox policy, associate users with the UM mailbox policy, and then have the users verify that they can receive voice mail previews in their voice messages in Outlook 2010 or a later version or Outlook Web App. For more information about how to configure UM for a Voice Mail Preview partner, see Configure Voice Mail Preview Partner Services for Users.

Configuring VoIP gateways and IP PBXs for your organization is a difficult deployment task that must be completed correctly to successfully deploy Unified Messaging with a Voice Mail Preview partner. For information that can help you configure your VoIP gateways and IP PBXs, and for the most up-to-date information about how to configure them, see Telephony Advisor for Exchange 2013 or Configuration Notes for Supported VoIP Gateways, IP PBXs, and PBXs.

Testing interoperability of Exchange UM with VoIP gateways has been integrated with the Microsoft Unified Communications Open Interoperability Program. For more information, see Microsoft Unified Communications Open Interoperability Program.

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