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Packet loss occurs when you connect a telephone that has Lync 2010 Phone Edition installed to a computer

Article ID: 2673305 - View products that this article applies to.

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SYMPTOMS

Consider the following scenario:

You have Microsoft Lync 2010 Phone Edition installed on one of the following telephones:
- Polycom CX600
- Aastra 6721ip
- Aastra 6725ip
- HP 4110
- HP 4120
You connect a computer that has Lync 2010 installed to the PC port on the telephone.
You try to receive a multicast stream on the computer.

In this scenario, packet loss occurs. For example, when you view a multicast video stream, the video output is choppy.

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CAUSE

This issue occurs because the telephone device driver is handled incorrectly.

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RESOLUTION

To resolve this issue, install the appropriate cumulative update for the telephone that you are using:

For HP 4110 and HP 4120 telephones

2672743

(http://support.microsoft.com/kb/2672743/ )

Description of the cumulative update for Lync 2010 Phone Edition for HP 4110 and HP 4120: February 2012

For Polycom CX500, Polycom CX600, and Polycom CX3000 telephones

2672349

(http://support.microsoft.com/kb/2672349 / )

Description of the cumulative update for Lync 2010 Phone Edition for Polycom CX500, Polycom CX600, and Polycom CX3000: February 2012

For Aastra 6721ip and Aastra 6725ip telephones

2672352

(http://support.microsoft.com/kb/2672352/ )

Description of the cumulative update for Lync 2010 Phone Edition for Aastra 6721ip and Aastra 6725ip: February 2012

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The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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