Sunday, October 23, 2022

A telephone does not correctly obtain a VLAN ID when the VLAN ID is higher than 512 in Lync 2010 Phone Edition [MS]

Symptoms

A telephone that is running Microsoft Lync 2010 Phone Edition does not correctly obtain a virtual local area network (VLAN) ID from the network switches by using Link Layer Discovery Protocol (LLDP) when the VLAN ID is higher than 512.

Cause

This issue occurs because Lync 2010 Phone Edition only reads 9 bits of the VLAN ID field, which is a 12-bit field. Therefore, the other bits are ignored when the VLAN ID is higher than 512.

Resolution

To resolve this issue, install the following cumulative update:

For Polycom CX700 and LG-Nortel IP Phone 8540 telephones:

2577593 Description of the cumulative update for Microsoft Lync 2010 Phone Edition for Polycom CX700 and LG-Nortel IP Phone 8540: July 2011
For Polycom CX500, Polycom CX600 and Polycom CX3000 telephones:

2577594 Description of the cumulative update for Lync 2010 Phone Edition for Polycom CX500, Polycom CX600, and Polycom CX3000: July 2011
For Aastra 6721ip and Aastra 6725ip telephones:

2577595 Description of the cumulative update for Lync 2010 Phone Edition for Aastra 6721ip and Aastra 6725ip: July 2011

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