Topic Last Modified: 2012-03-25

Used to assign the default realm (SIP Communications Service) to a collection of proxy configuration settings. Realms (also known as protection domains) are used to authenticate user credentials during logon.


Proxy servers provide a way for users outside your internal network to access resources on your internal network. Each proxy server must be associated with a realm; realms (also known as protection domains) indicate where a user’s logon credentials should be processed. By default, Microsoft Lync Server 2010 uses SIP Communications Service as its default realm; however, it is possible to change the realm employed by a proxy server. If you change the realm and then want to revert back to using the default realm, you can do so by creating a SipProxy.UseDefault object, and then assigning that object to the Realm property of the appropriate proxy server (or servers).

Who can run this cmdlet: By default, members of the following groups are authorized to run the New-CsSipProxyUseDefault cmdlet locally: RTCUniversalServerAdmins. To return a list of all the role-based access control (RBAC) roles this cmdlet has been assigned to (including any custom RBAC roles you have created yourself), run the following command from the Windows PowerShell prompt:

Get-CsAdminRole | Where-Object {$_.Cmdlets –match "New-CsSipProxyUseDefault"}


Parameter Required Type Description



Switch Parameter

Reports detailed activity to the screen as the cmdlet runs.

None. New-CsSipProxyUseDefault does not accept pipelined input.

New-CsSipProxyUseDefault creates new instances of the Microsoft.Rtc.Management.WritableConfig.Settings.SipProxy.UseDefault object.

-------------------------- Example 1 ------------------------

$x = New-CsSipProxyUseDefault

The command shown in Example 1 assigns the default realm (SIP Communications Service) to a variable named $x.