Symptoms
Consider the following scenario:
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You sign in to the 14.0.5 version of Microsoft Lync for Mac 2011.
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You make multiple calls by using the Lync for Mac 2011 client. For example, you make from 6 to 10 calls.
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You try to make another call.
In this scenario, the call fails. Additionally, you receive the following error message:
Cannot connect to the call
Note After this issue occurs, you can’t make or receive calls until you restart Lync for Mac 2011 and then sign in again.
Resolution
To resolve this issue, install the following cumulative update:
2884053 Description of the Microsoft Lync for Mac 2011 14.0.5 hotfix