Log on to the server as a member of the Administrators group.

Start the Lync Server Management Shell: Click Start, click All Programs, click Microsoft Lync Server 2010, and then click Lync Server Management Shell.

Get the current port ranges: At a command prompt, type one of the following, as appropriate, and then press Enter:

• For a Front End Server or a stand-alone A/V Conferencing Server:
  
  

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  Get-CsService -ConferencingServer

• For a Mediation Server:
  
  

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  Get-CsService -MediationServer

Change the port range settings as necessary: At a command prompt, type one of the following, as appropriate, including only the parameters that you want to change, and then press Enter:

• For Conferencing Servers collocated on Front End Server or a stand-alone A/V Conferencing Server:
  
  

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  Set-CsConferencingConfiguration -AudioPortStart <beginning of port range, 1024 or higher> -AudioPortCount <number of ports, at least 128> -VideoPortStart <beginning of port range, 1024 or higher > -VideoPortCount <number of ports, at least 128> -AppSharingPortStart <beginning of port range> -AppSharingPortCount <number of ports, at least 4>

• For a Mediation Server:
  
  

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  Set-CsMediationServer -AudioPortStart <beginning of port range> -AudioPortCount <number of ports>

• For an Application Server:
  
  

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  Set-CsApplicationServer -AudioPortStart <beginning of port range> -AudioPortCount <number of ports, at least 20> -AppSharingPortStart <beginning of port range> -AppSharingPortCount <number of ports, at least 4> -VideoPortStart <beginning of port range> -VideoPortCount <number of ports, at least 40>

To update these settings immediately, stop and then restart the affected services.

Log on as a member of the Administrators group to the server where your Lync Server topology is published.

Start the Lync Server Management Shell: Click Start, click All Programs, click Microsoft Lync Server 2010, and then click Lync Server Management Shell.

Change the port range settings as necessary: At a command prompt, type the following, and then press Enter:

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Set-CsEdgeServer -Identity: <FQDN of Edge Server> -MediaCommunicationPortStart <beginning of port range, default 50000> -MediaCommunicationPortCount <number of ports, default 10000>

To update these settings immediately, stop and then restart the affected services.