Microsoft KB Archive Search

Notice: This website is an unofficial Microsoft Knowledge Base (hereinafter KB) archive and is intended to provide a reliable access to deleted content from Microsoft KB. All KB articles are owned by Microsoft Corporation. Read full disclaimer for more details.

  1. Home
  2. FIX: The SIP filter in Forefront Threat Management Gateway 2010 may prevent an internal client from hanging up a call

FIX: The SIP filter in Forefront Threat Management Gateway 2010 may prevent an internal client from hanging up a call

View products that this article applies to.

Symptoms

The SIP filter in Microsoft Forefront Threat Management Gateway (TMG) 2010 may prevent an internal client from hanging up a call because TMG may drop the BYE message from the client.

↑ Back to the top

Cause

This problem occurs because certain clients may increase the message sequence number (CSeq) for the BYE request if the user tries to hang up the call before the remote end answers the telephone. The SIP filter in TMG does not expect this, and the message is dropped. The call cannot end until the client sends a CANCEL message.

↑ Back to the top

Resolution

To resolve this problem, install the service pack that is described in the following Microsoft Knowledge Base article:
2555840 Description of Service Pack 2 for Microsoft Forefront Threat Management Gateway 2010

↑ Back to the top

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

↑ Back to the top

References

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

↑ Back to the top

Keywords: kbfix, kbbug, kbexpertiseinter, kbsurveynew, kb

↑ Back to the top

Article Info
Article ID : 2591278
Revision : 1
Created on : 1/7/2017
Published on : 10/31/2011
Exists online : False
Views : 187