MarkC on UC Microsoft Skype for Business, Lync, Exchange & Everything Else

Enabling Extension Number Display in Lync 2013 or Skype for Business

How do you enable viewing of extension numbers in the Lync or Skype for Business client?

I'm working on a site at the minute that has disjointed extension/DDI numbers - that is their extension numbers in no way match their assigned DDI. Throw in some routing to legacy PBX platforms…and your dial plan gets 'interesting'.

Anyway, one thing I wanted to do was to turn on the ability to view extension numbers in the Skype client. What do I mean I hear you say - well, consider the normal display when I type in an extension number:


You'll see the normalised number - notice how 8622 actually maps to a 5831 number - but it would be useful to see the extension, like this:


With this set, it displays the extension as well - of course you have to have it normalised like that in your dial-plan and your address book rules for it to appear as above.

Anyway, how do we achieve this? Well, it's pretty easy. You can do it in a client policy, like this:

$x = New-CsClientPolicyEntry -Name "ShowExtensionInFormattedDisplayString" -Value "True"
$y = Get-CsClientPolicy -Identity Global
Set-CsClientPolicy -Instance $y

The above puts it in the Global policy, but you could if you wanted create a new one, and assign that. See here on the processes for adding options to client policies:


WAIT! What if I want to remove it? Well, again it's pretty easy.

$y = Get-CsClientPolicy -Identity global
Set-CsClientPolicy -Instance $y

The above assume it's the first policy entry - you'll need to update it to match the actual entry if you have multiple ones. Note you can clear all of them too using this command:

Set-CsClientPolicy -Identity global -PolicyEntry $Null

Fairly simple stuff. This capability was first introduced back with Lync 2010 - see here for info:

An update is available to display the extension number of non-US telephone numbers in contact cards in Lync 2010

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