Delay processing incoming calls in Lync Server 2010

Applies to: Lync Server 2010 Standard EditionLync Server 2010 Enterprise Edition

Symptoms

Consider the following scenario:
  • A  public switched telephone network (PSTN) gateway or a private branch exchange (PBX) that sends non-E.164-compliant numbers is deployed in a Microsoft Lync Server 2010 environment.
  • The dial plan that is associated with the PSTN gateway or with the PBX has more than 700 normalization rules.
  • A telephone call is made from the PSTN gateway or the PBX to a Lync 2010 user who has Enterprise Voice enabled.
In this scenario, the Lync Server 2010 server takes several seconds to process the call.

Cause

This issue occurs because the translation service on the server encounters a delay. Specifically, there is a delay of approximately one second for every 100 normalization rules that are processed.

Resolution

To resolve this issue, install the following cumulative update:
2670352 Description of the cumulative update for Lync Server 2010: February 2012

More Information

For more information about dial plans and normalization rules, visit the following Microsoft website:
General information about dial plans and normalization rules
For more information about how to configure dial plans and normalization rules, visit the following Microsoft website:
How to configure dial plans and normalization rules