Mar 12

OCS MCM in May

Great news, I will be attending the OCS Microsoft Certified Master program in May.  More info about the program can be found here and here.

So from 3rd till the 22nd of May, I’ll be in Redmond

All OCS MCM’s in Europe are: Continue reading

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Feb 23

OCS 2007 R2 && MSI update troubleshooting

We’ve had a few customers that have OCS 2007 R2 Standard Edition implemented for a Proof of Concept environment.
Deployment of the OCS updates failed and therefore the Front-end Service didn’t start….
This was the eventviewer notice:

Product: Microsoft Office Communications Server 2007 R2, Standard Edition Server - Update 'Office Communications Server 2007 R2 (KB967831)' could not be installed. Error code 1603. Windows Installer can create logs to help troubleshoot issues with installing software packages.

I used the following registry setting to validate why the update failed
Open the registry with Regedt32.exe and create the following path and keys:
Reg_SZ: Logging
Value: voicewarmup Continue reading

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Jan 29

71-404 (74-404); Microsoft Office Communications Server 2007 R2 —UC Voice Specialization

On the 28th of January, I’ve done the Beta of the OCS 2007 R2 Voice Specialization Exam. It was ‘do-able’.
Topics that are covered are a lot like the OCS 2007 R1 version Exam (74-924), but differ a bit.

You’re knowledge should cover at least the following topics:
– Edge differences between R1 and R2;
– OCS integration with Exchange UM;
– Normalization rules;
Continue reading

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Jan 21

74-294; Microsoft Office Communications Server 2007—UC Voice Specialization

Here are some topics to help you with the preparations for the 74-924 exam. Because there are no self-paced training kits, e-learnings etc….

At least know about the following topics:

Voice capacity planning (light users, medium users, heavy users, E1, T1)
 light:  1 call/hour  -> 15 users use 1 port
 med: 2 calls/hour -> 10 users use  1 port
 heavy: 3 calls/hour -> 5 users use 1 port

You need this for capacity requirements/planning Continue reading

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Jan 20

MSN PIC will add extra IP, you might need to change your firewall…


In an effort to provide enhanced capacity and service reliance, Windows Live Messenger will soon be adding an additional IP address used for PIC/Federation traffic.  Some organizations have chosen to restrict this type of traffic to specific IP addresses, as referenced in Microsoft KB 897567 (  With this in mind we want to give you advanced notice of our intended change if you have configured your enterprise network in this manner.

Please ensure your enterprise firewall configuration is updated with the full list of Windows Live Messenger addresses below on or before Friday, February 2, 2010.  Windows Live Messenger will NOT enable the additional IP address until on or after February 2, 2010 (Pacific Time) to ensure your services will not be disrupted by this change.

IP address for Windows Live Messenger PIC/Federation: (Additional new IP address)

Continue reading

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Jan 19

OCS Audio Codecs

I’ve found some great tabels regarding audio codecs used and the bandwith they require. Note that MOS stands for mean opinion score, which is a subjective rating of sound quality
First the narrow band:

Narrowband VoIP codecs
Codec Payload bandwidth MOS Description
G.711 64 kbps 4.1 This is the most universally supported codec used in IP telephony.  This narrowband codec supports frequencies in the 300 to 3,400 hertz range and is uncompressed. Although the quality is very good, it consumes a lot of bandwidth.
G.729 8 kbps 3.92 This is the second most supported codec and offers nearly the same quality as G.711. The key advantage is that it is compressed eight times smaller than G.711 while sounding almost as good.

And second, wideband for a rich VoIP experience: Continue reading

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Jan 18

LiveMeeting client and Outlook Add-in updates

there are new updates available for LiveMeeting.

Here are the direct download links:
– LM Console:
– LM Addin for Outlook (32-bit and 64-bit):

Issues that this LiveMeeting update package fixes:
– PowerPoint slides that are shared and recorded in Live Meeting 2007 do not show in the recording playback on a computer that has Office 2010 installed
– An organizer can still share desktop controls with the participants in a Live Meeting 2007 session after a conferencing center administrator enables the “Disable Desktop Sharing” setting
– The Question and Answer Control Panel modality and the Chat modality become unavailable in the Live Meeting 2007 add-in when either one of these modalities is disabled by an administrator
– A conference center administrator cannot restrict application sharing to only a single program in the Live Meeting service

Continue reading

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Jan 18

OCS Client for Linux

Just received a question if a linux client is able to connect to the OCS environment… Guess what, it’s out there…..
Enjoy connecting the Linux environment to the OCS environment….

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Jan 11

OCS 2007 R2 Cumulative Update #4

New updates are avaiable for OCS 2007 R2, it is #4.
OCS 2007 R2:
OCS 2007 R2 Group Chat (server and clients):
MOC 2007 R2:
MOC 2007 R2, Phone Edition:

Just as a reminder… all updates are posted here…

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Dec 21

Want to test OCS Remote Connectivity? Here is how!!

The Office Communications Server Remote Connectivity Analyzer is a great tool for performing testing, troubleshooting, and diagnostics on OCS 2007 & OCS 2007 R2 deployments. The tool will assist you in finding answers to the before mentioned scenarios.  You should use the RCA as your initial stop when attempting to troubleshoot an OCS edge server connectivity issue.  

The Office Communications Server Remote Connectivity Analyzer is a web site for IT Administrators to validate and diagnose end-to-end Office Communications Server scenarios. The site simulates multiple Office Communications Server client access scenarios from outside the customer’s infrastructure and reports whether the test was successful.  If the test fails, we inform the IT Admin exactly where in the process it failed as well as provide troubleshooting tips on resolving the issue.

The OCS Remote Connectivity Analyzer is found here:

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