Difference between Open and Closed Federation in Lync/SfB Server

One of the features that Lync Server and Skype for Business Server has and customers like is the ability to federate with another company. This post will focus only on Lync/SfB to Lync/SfB or Lync/SfB to OCS federation. Usually, Lync/SfB administrators don’t know if they have an open or closed federation – why is that so? Because it’s only a matter of checking a box and the description isn’t really helpful.

So, how do we know if we have an open federation? Simply open your Lync/SfB Control Panel, then Federation and External Access -> Access Edge Configuration and double click Global:


If Enable partner domain discovery is checked, it means the federation is open. Using PowerShell, check if the EnablePartnerDiscovey is set to True with:



To close the federation you need to remove the Enable partner domain discovery checkbox in the Lync Control Panel or run the cmdlet:

Set-CsAccessEdgeConfiguration -UseDnsSrvRouting -EnablePartnerDiscovery $False

Make sure that Lync replication is working to all Lync servers. We can go to replication with:


And check the replication with:



In the Lync Control Panel, we can also check the replication status:


With a closed federation we need to manually configure each allowed sip domain:


And fill with the right parameters:


If we don’t know the partners Access Edge Service (FQDN), we need to do a SRV DNS lookup for _sipfederationtls._tcp.<sip domain>. This can be achieved in a Command Prompt or PowerShell:

nslookup -type=srv _sipfederationtls._tcp.lync2010.uclobby

Even if we close the federation, it’s really important to leave the SRV record _sipfederationtls._tcp.<sip domain> in the external DNS. Thus, if we allow a partner that has already an open federation, our partner doesn’t need to change his configuration.

Last reminder: there is a list of companies that use OCS/Lync, so feel free to add yours:

Lync Federation Directory

Lync Server 2013 Cumulative Update List: July 2018

Since we already have a Lync Server 2010 Cumulative Update List it makes sense to have the same for Lync Server 2013. We can use the PowerShell cmdlet described in Lync Server Component Version to know which version is installed.

After running Lync Server Update package, not all components will be updated to the latest version – this is a normal behavior, however you can use Lync Server Core Component as reference, since this component is always updated. In case of doubt, if all components were updated, you can run the update package again or check the update logs.

In the following link you can get the latest update:

Updates for Lync Server 2013

Download latest update for Lync Server 2013

Finally, here is a list of all cumulative updates released for Lync Server 2013:

Version Cumulative Update KB Article
5.0.8308.1001 July 2018 (CU10) http://support.microsoft.com/kb/4295703
5.0.8308.992 July 2017 (CU9) http://support.microsoft.com/kb/4019183
5.0.8308.987 March 2017 (CU8 HF4) http://support.microsoft.com/kb/4014154
5.0.8308.984 January 2017 (CU8 HF3) http://support.microsoft.com/kb/3210166
5.0.8308.977 December 2016 (CU8 HF2) http://support.microsoft.com/kb/3212869
5.0.8308.974 November 2016 (CU8 HF1) http://support.microsoft.com/kb/3200079
5.0.8308.965 August 2016 (CU8) http://support.microsoft.com/kb/3175336
5.0.8308.949 April 2016 (CU7) http://support.microsoft.com/kb/3140581
5.0.8308.945 January 2016 (CU6 HF2) http://support.microsoft.com/kb/3126637
5.0.8308.941 December 2015 (CU6 HF1) http://support.microsoft.com/kb/3121213
5.0.8308.933 September 2015 (CU6) http://support.microsoft.com/kb/3081739
5.0.8308.920 July 2015 (CU5 HF10) http://support.microsoft.com/kb/3064728
5.0.8308.887 May 2015 (CU5 HF9) http://support.microsoft.com/kb/3051951
5.0.8308.872 February 2015 (CU5 HF8) http://support.microsoft.com/kb/3031065
5.0.8308.866 December 31, 2014 (CU5 HF7.1) http://support.microsoft.com/kb/3027553
5.0.8308.857 December 2014 (CU5 HF7) http://support.microsoft.com/kb/3018232
5.0.8308.834 November 2014 (CU5 HF6) http://support.microsoft.com/kb/3010028
5.0.8308.831 October 2014 (CU5 HF5) http://support.microsoft.com/kb/3003358
5.0.8308.815 September 2014 (CU5 HF2) http://support.microsoft.com/kb/2987511
5.0.8308.738 August 2014 (CU5) http://support.microsoft.com/kb/2937305
5.0.8308.577 January 2014 (CU4) http://support.microsoft.com/kb/2905040
5.0.8308.556 October 2013 (CU3) http://support.microsoft.com/kb/2881682
5.0.8308.420 July 2013 (CU2) http://support.microsoft.com/kb/2835432
5.0.8308.291 February 2013 (CU1) http://support.microsoft.com/kb/2781550
5.0.8308.0 RTM NA

Lync Server 2010 Cumulative Update List: April 2016

In a previous article we discussed how to check Lync Server Component Version. After checking the versions, a good thing is a table to verify what Cumulative Update were installed in the server. We can use the Lync Server Core Component as reference, since this component is always updated.

When we update Lync Server, not all components will be updated to the latest version – this is a normal behavior. After running the update, we can run again the update package to check if all components were successfully updated.

In the following link you can get the latest update:

Updates for Lync Server 2010

Finally, here is a list of all cumulative updates released for Lync Server 2010:

Version Cumulative Update KB Article
4.0.7577.728 April 2016 http://support.microsoft.com/kb/3148801
4.0.7577.713 May 2015 http://support.microsoft.com/kb/3057803
4.0.7577.710 February 2015 http://support.microsoft.com/kb/3030726
4.0.7577.230 April 2014 http://support.microsoft.com/kb/2957044
4.0.7577.225 January 2014 http://support.microsoft.com/kb/2909888
4.0.7577.223 October 2013 http://support.microsoft.com/kb/2889610
4.0.7577.217 July 2013 http://support.microsoft.com/kb/2860700
4.0.7577.216 March 2013 http://support.microsoft.com/kb/2791381
4.0.7577.203 October 2012 http://support.microsoft.com/kb/2737915
4.0.7577.199 June 2012 http://support.microsoft.com/kb/2701585
4.0.7577.190 February 2012 http://support.microsoft.com/kb/2670352
4.0.7577.183 November 2011 http://support.microsoft.com/kb/2514980
4.0.7577.166 July 2011 http://support.microsoft.com/kb/2571546
4.0.7577.137 April 2011 http://support.microsoft.com/kb/2500442
4.0.7577.108 January 2011 http://support.microsoft.com/kb/2467775
4.0.7577.0 RTM NA