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Users cannot hear ring-back tone for outbound calls through PSTN in Lync for Mac 2011

Symptoms
Consider the following scenario:
  • An Enterprise Voice-enabled user signs in to Microsoft Lync for Mac 2011 in a Lync Server 2010 environment.
  • The user calls a Public Switched Telephone Network (PSTN) number.
  • The early media on the PSTN gateway is turned off in the environment.
In this scenario, even though the phone that is receiving the call is ringing, the caller cannot hear a ring-back tone.
Cause
This issue occurs because a local ring-back tone is not generated when the caller makes an outbound call through PSTN in Lync for Mac 2011.
Resolution
To resolve the issue, install the following cumulative update:
2844274 Description of the Microsoft Lync for Mac 2011 14.0.5 update
More information
For more information about early media, go to the following Microsoft website:
Properties

Article ID: 2844273 - Last Review: 06/05/2013 22:05:00 - Revision: 1.0

Microsoft Lync for Mac 2011

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