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A NOTIFY message is sent on an ended subscription by a Lync Server 2010, Mediation server

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Symptoms

You run a Microsoft Unified Communications Managed API (UCMA) endpoint on a Lync Server 2010 server. In this situation, you might find the following call flow in the trace log during a blind transfer that involves an UCMA endpoint:
  • The UCMA client sends a REFER message to the Mediation server.
  • The Mediation server accepts the REFER message, and then tries to transfer the calls.
  • The UCMA client sends a SUBSCRIBE message to end the REFER subscription.
  • The Mediation server sends the NOTIFY message that contains a 200 OK event on the ended REFER subscription. 
  • The call is ended.
Note Generally, the Mediation server should not try to send the NOTIFY message on an ended subscription.

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Cause

This issue occurs because the Mediation server ignores the SubscriptionTerminated event. Therefore, an exception is caused when the NOTIFY message is sent, and then the call is ended.

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Resolution

To resolve this issue, install the following cumulative update:
2640253 Description of the cumulative update for Lync Server 2010, Mediation Server: November 2011


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Keywords: kbqfe, kbfix, kbsurveynew, kbexpertiseadvanced, kbhotfixrollup, kb

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Article Info
Article ID : 2621832
Revision : 1
Created on : 1/7/2017
Published on : 11/19/2011
Exists online : False
Views : 317