Change the audio codec


Applies to: Exchange Online, Exchange Server 2013, Exchange Server 2016

Topic Last Modified: 2013-02-22

Unified Messaging can use one of four codecs for creating voice mail messages: MP3, Windows Media Audio (WMA), Group System Mobile (GSM) 06.10, and G.711 Pulse Code Modulation (PCM) Linear. By default, when you create a Unified Messaging (UM) dial plan, the UM dial plan uses the MP3 audio codec to record voice messages. The MP3 audio format is a popular audio format that is used across multiple operating systems, email clients, and MP3 players. After the UM dial plan is created, you can configure the UM dial plan to use one of the other audio formats including the WMA, GSM 06.10, or G.711 PCM Linear audio codecs. To listen to the voice message, a mobile phone or computer must have a compatible audio software application installed.

For additional tasks related to UM dial plans, see UM dial plan procedures.

  • Estimated time to complete: Less than 1 minute.

  • You need to be assigned permissions before you can perform this procedure or procedures. To see what permissions you need, see the "UM dial plans" entry in the Unified Messaging permissions topic.

  • Before you perform these procedures, confirm that a UM dial plan has been created. For detailed steps, see Create a UM dial plan.

  • For information about keyboard shortcuts that may apply to the procedures in this topic, see Keyboard shortcuts in the Exchange admin center.

Having problems? Ask for help in the Exchange forums. Visit the forums at Exchange Server, Exchange Online, or Exchange Online Protection..

  1. In the EAC, navigate to Unified Messaging > UM dial plans.

  2. In the list view, select the UM dial plan you want to modify, and then click Edit Edit icon.

  3. On the UM dial plan page, click Configure.

  4. In Settings, under Audio codec, use the drop-down list to select one the following:

    • MP3

    • WMA

    • GSM

    • G711

  5. Click Save.

This example sets the audio codec on a UM dial plan named MyUMDialPlan to G.711.

Set-UMDialPlan -Identity MyUMDialPlan -AudioCodec G711

This example sets the audio codec on a UM dial plan named MyUMDialPlan to WMA.

Set-UMDialPlan -Identity MyUMDialPlan -AudioCodec Wma