Audio delay when answering call

I’ve been having some trouble lately with call setup on incoming calls. After the call has been answered, there has in some cases gone up to 8-9 seconds before you can hear the person on the other side. Obviously this is quite a pain…

When trying to google the problem you get a lot of posts telling you to disable Windows Firewall. This actually solves the problem so if you are content with just disabling a firewall without knowing why, you can stop reading now.

Seems that when you install the mediation server on a Windows Server 2008 the firewall fails to open the proper UDP port negotiated during the RFC 3690 Early media negotiation until Windows Firewall detects an outgoing UDP stream. This can be solved/worked around by adding an inbound rule in the firewall that allows all UDP ports.

Thanks to JeffNye for tipping me in the right direction!

Installing OCS 2007 R2 Prerequisites on Windows Server 2008

This post was not written by me, but by my excellent colleague Ståle. Kudos! Pay his blog a visit ^^

TI

Commands to install the necessary prerequisites for OCS 2007 R2 on Windows Server 2008

Front End on Windows Server 2008
Servermanagercmd.exe -install web-windows-auth web-mgmt-compat web-mgmt-console web-http-logging msmq-server msmq-directory powershell was-process-model was-config-apis rsat-addc

Installs the following components:

  • [Web-Windows-Auth] – Windows Authentication
  • [Web-Mgmt-Compat] – IIS 6 Management Compatibility
  • [MSMQ-Server] – Message Queuing Server
  • [MSMQ-Directory] – Directory Service Integration
  • [RSAT-ADDC] – Active Directory Domain Controller Tools
  • [WAS-Process-Model] – Process Model
  • [WAS-Config-APIs] – Configuration APIs
  • [Web-Mgmt-Console] – IIS Management Console
  • [Web-Http-Logging] – HTTP Logging
  • [PowerShell] – Windows PowerShell

The last 3 in the list are not required, but they are highly recommended. IIS 7.0 Management Console is IMHO much easier to use than the IIS 6.0 version. The logging tools often come in handy when troubleshooting OCS IIS issues and PowerShell makes working with OCS WMI values a piece of cake.

Monitoring Server on Windows Server 2008
Servermanagercmd.exe -install msmq-server msmq-directory

Installs the following components:

  • [MSMQ-Server] – Message Queuing Server
  • [MSMQ-Directory] – Directory Service Integration

CWA Server on Windows Server 2008
Servermanagercmd.exe -install web-windows-auth web-mgmt-compat web-mgmt-console web-http-logging

Installs the following components:

  • [Web-Windows-Auth] – Windows Authentication
  • [Web-Mgmt-Compat] – IIS 6 Management Compatibility
  • [Web-Mgmt-Console] – IIS Management Console
  • [Web-Http-Logging] – HTTP Logging

Mediation Server on Windows Server 2008
Servermanagercmd.exe -install rsat-addc

Installs the following components:

  • [RSAT-ADDC] – Active Directory Domain Controller Tools

Post used as a reference for this post

http://waveformation.com/2009/06/02/installing-ocs-2007-r2-prerequisites-on-windows-server-2008/