Mino – The UC Guy

Microsoft Unified Communications Blog

Posts Tagged ‘Communicator 2007 R2 client’

How to allow domain users to connect to Lync 2010 or OCS 2007 from Clients running on non-domain computers

Posted by Mino on September 15, 2010

I had a situation in our company where we have exceptional few users who got Domain credentials but they are working on Computers that are not joined to the domain.

However these computers run over the LAN or WAN, can communicate with the internal DNS and got the certificate chain of the CA imported to them and they use DOMAIN\UID and password credentials to login to mail , MOSS and everything is working fine.

When I installed the OCS 2007 R2 client on their machines and tried to login with the same behavior as mail using DOMAIN\UID , I was not able to log in and I received the below event log warning:

"Communicator was unable to authenticate because an authenticating authority was not reachable.”
Resolution:
The server may be asking for Kerberos authentication and Communicator is not able to find the Kerberos Domain Controller in order to generate credentials and authenticate.  The network administrator will need to change the configuration on the server to utilize only NTLM authentication before Communicator can login from this location properly, or connectivity will need to be made available to an authenticating authority"

 

also as for testing I removed the OCS 2007 R2 client and installed the new Lync RC client on the same machine , I know it is not supported scenario but I was just testing it. Now the user was able to login but it disconnects after 10 seconds then reconnects again , it keep in this loop. I also found the same warning in the event log.

I know why this is happening and I know it would have been solved from the beginning if i forced the OCS to use NTLM only rather than Kerberos but this was not something i can force.

So in the end the Solution was this problem was simple :

Ensure that the users when singing in to communicator 2007 or Lync 2010 to include the ".local" in the domain.local\username part of the authentication and not DOMAIN\username.

Posted in Common Errors, communicator client, Lync 2010 Client | Tagged: , , , | 3 Comments »

No Name Appears When Callings from OC to Cisco or vice versa

Posted by Mino on August 10, 2009

One of the frustrating drawbacks when Implementing OCS enterprise voice integrating with Cisco Call Manager or other PBX is that No name would appear in Communicator 2007 when a telephone user calls a Communications Server 2007 user or vice versa .

The only solution by then was to place a media gateway in the middle between mediation and IP-PBX and use a translation feature built in the media gateway to edit the packet header and add Caller Name before sending it to the PBX.

But Finally Microsoft has listened to my prayers and they have released July fix for OCS 2007 R2, once they were released our team started to do the testing in our LABs. At the beginning things didn’t work fine but in the end it worked and it appeared that we only applied the server side updates while the KB 971844 includes Office Communicator update too.

However, even with these fixes, this don’t send display name by default. So, this configuration in KB 972721 will be also necessary. Below are the snapshots taken by our Engineer Amr Nassar who has worked on this and successfully made it work after applying those Fixes.

Calling from Office Communicator R2 with ext 6000 to Cisco IP Phone with ext 10000

From OCS

Calling from  Cisco IP Phone with ext 10000 to Office Communicator R2 with ext 6000 

From Cisco

But let me also share Microsoft explanation on why this problem happens in the first place and what these updates fix?

Problem Explanation:

When a Private Branch Exchange (PBX) telephone user calls a Microsoft Office Communications Server (OCS) 2007 R2 user, the calling party name that exists in PBX is stripped at the OCS 2007 R2 Mediation Server. Because the PBX telephone user does not exist in Active Directory, no name appears in Microsoft Office Communicator 2007 R2

This problem occurs because the OCS 2007 R2 Mediation Server does not forward the display name information from the Unified Communications (UC) side to the gateway side. Therefore, the Communicator 2007 R2 client does not receive the display name information.

Update 970679 introduces functionality for the Mediation Server role of Communications Server 2007 R2 to forward Display Name information that is part of the From header between its gateway side and its proxy side.

A file called MediationServerSvc.exe.config should be created in the Mediation Installation Directory which be default is at  %programfiles%\Microsoft Office Communications Server 2007\Mediation Server

This file should contain.

<?xml version=”1.0″ encoding=”utf-8″ ?>
<configuration>
                 <appSettings>
                                <add key=”forwardDisplayName” value=”True” />
                 </appSettings>
</configuration>

Posted in AVAYA, Cisco 4.x Integration, Cisco 5.x Integration, Cisco 6.x Integration, Cisco 7.x Integration, communicator client, Mediation Server, Nortel CS1000, OCS 2007 R2, PBX Integration, Phone Edition, Quintum's gateways | Tagged: , , , , , , , , , , , , , , | 3 Comments »