In most cases, Microsoft recommend that you set simple URLs only at the global level, so that a user’s Meet simple URL does not change if they move from one site to another. The exception would be organizations that need to use different telephone numbers for dial-in users at different sites. Note that if you set a one simple URL (such as the Dial-in simple URL) at a site to be a site-level simple URL, you must also set the other simple URLs at that site to be site-level as well.
You can set only global simple URLs in Topology Builder. To set a simple URL at the site level, you must use the Set-CsSimpleURLConfiguration cmdlet.
Example
We have 3 Global Sites, Each site requires to be autonomous from each geographical region. (i.e. if the UK had a major failure, US, HK would not be effected.......
so we want to set each region with its local meeting and Dialin URL`s
Site 1 (USA) = https://lync.us.abc.com
Site 2 (UK) = https://lync.uk.abc.com
$simpleUrlEntry2 = New-CsSimpleUrlEntry -Url "https://lync.uk.abc.com/meet"
$simpleURL1 = New-CsSimpleUrl -Component "dialin" -Domain "*" -SimpleUrlEntry $simpleUrlEntry1 -ActiveUrl "https://lync.uk.abc.com/dialin"
$simpleURL2 = New-CsSimpleUrl -Component "meet" -Domain "abc.com" -SimpleUrlEntry $simpleUrlEntry2 -ActiveUrl "https://lync.uk.abc.com/meet"
New-CsSimpleUrlConfiguration -Identity site:LYNC-UK -SimpleUrl @{Add=$simpleUrl1, $simpleUrl2}
---------------------------------------------------------------------------
$simpleUrlEntry1 = New-CsSimpleUrlEntry -Url "https://lync.hk.abc.com/dialin"
$simpleUrlEntry2 = New-CsSimpleUrlEntry -Url "https://lync.hk.abc.com/meet"
$simpleURL1 = New-CsSimpleUrl -Component "dialin" -Domain "*" -SimpleUrlEntry $simpleUrlEntry1 -ActiveUrl "https://lync.hk.abc.com/dialin"
$simpleURL2 = New-CsSimpleUrl -Component "meet" -Domain "abc.com" -SimpleUrlEntry $simpleUrlEntry2 -ActiveUrl "https://lync.hk.abc.com/meet"
New-CsSimpleUrlConfiguration -Identity site:LYNC-HK -SimpleUrl @{Add=$simpleUrl1, $simpleUrl2}
---------------------------------------------------------------------------
$simpleUrlEntry1 = New-CsSimpleUrlEntry -Url "https://lync.us.abc.com/dialin"
$simpleUrlEntry2 = New-CsSimpleUrlEntry -Url "https://lync.us.abc.com/meet"
$simpleURL1 = New-CsSimpleUrl -Component "dialin" -Domain "*" -SimpleUrlEntry $simpleUrlEntry1 -ActiveUrl "https://lync.us.abc.com/dialin"
$simpleURL2 = New-CsSimpleUrl -Component "meet" -Domain "abc.com" -SimpleUrlEntry $simpleUrlEntry2 -ActiveUrl "https://lync.us.abc.com/meet"
New-CsSimpleUrlConfiguration -Identity site:LYNC-US -SimpleUrl @{Add=$simpleUrl1, $simpleUrl2}