UC Unleashed

Wanna see who you’re dynamically (openly) federating within Lync Server? It’s pretty straightforward with the Get-EventLog cmdlet. All we need to do is look for the most recent entry in the Lync Server event log with event ID 14601. One an Edge server, open PowerShell and run the following:

Get-EventLog "Lync Server" | Where-Object {$_.EventId -eq 14601} | Select-Object EventId, Message -First 1 | Format-List *

The description of the single returned event will list the domains you’re currently dynamically federating with. You’ll get something back like this:

EventID : 14601
Message : Report of discovered partners that the Access Edge Server is
          currently monitoring.
There are 21 discovered partners, identified by the common name of
their certificate.
Name: sip-na.contoso.com; Domains: contoso.com
Name: sip.fabrikam.com; Domains: fabrikam.com
Name: sip.fourthcoffee.com; Domains: fourthcofee.com
Name: sip.windtiptoys.com; Domains: windtiptoys.com
Name: edge.adatum.com; Domains: adatum.com
Name: sip.humongousinsurance.com; Domains: humongousinsurance.com
Name: LYNC-TOR-Edge.litware.com; Domains: litware.com
Name: sip.northwindtraders.com; Domains: northwindtraders.com
Name: sip.proseware.com; Domains: proseware.com
Name: sip.adventure-works.com; Domains: adventure-works.com
Name: sipeu.alpineskihouse.com; Domains: alpineskihouse.com
Name: Lyncedge.blueyonderairlines.com; Domains: blueyonderairlines.com
Name: ussea-w15access.cohovineyard.com; Domains: cohovineyard.com
Name: sip.cohowinery.com; Domains: cohowinery.com
Name: sip.lucernepublishing.com; Domains: lucernepublishing.com
Name: ap.malvertising.info; Domains: malvertising.info
Name: federation.fineartschool.net; Domains: fineartschool.net
Name: sip.strikestrike.com; Domains: strikestrike.com
Name: lync.treyresearch.net; Domains: treyresearch.net
Name: sip.wideworldimporters.com; Domains: wideworldimporters.com
Name: sip.woodgrovebank.com; Domains: woodgrovebank.com*

A note that as the Message field of the event log entry mentions, these are DISCOVERED PARTNERS – those found through SRV records. If you want to see who you’re federating with using enhanced or direct federation (those specifically defined in your Lync environment), from a non-Edge Lync server, run Get-CsAllowedDomain. For a breakdown on the various types of federation, see Kevin Peter’s excellent post A Few Words on Federation.