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Audio quality gradually decreases when many users from a Public Switched Telephone Network make a conference call by using Mediation Server to connect to a CAA server in Communications Server 2007
| Article ID | : | 955996 |
| Last Review | : | August 15, 2008 |
| Revision | : | 1.0 |
SYMPTOMS
Consider the following scenario:
| • | You have installed the Conference Auto Attendant (CAA) server role on a computer that is running Microsoft Office Communications Server 2007 R2. |
| • | A conference call between many users from a Public Switched Telephone Network (PSTN) is established by using a computer that is running the Communications Server 2007 Mediation Server role to connect to the CAA server. |
| • | The CAA server forwards the call to a computer that is running the Communications Server 2007 A\V Conferencing Server role. |
| • | A channel for the conference call traffic is established between Mediation Server and A\V Conferencing Server.
Note CAA is a new server role that is included in Communications Server 2007 R2. Mediation Server and A\V Conferencing Server are existing server roles in Communications Server 2007. |
In this scenario, the audio quality gradually decreases.
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CAUSE
This issue occurs because the Real-Time Control Protocol (RTCP) BYE packet is continuously exchanged between the A\V Conferencing Server computer and the Mediation Server computer for each user who leaves the conference call.
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RESOLUTION
To resolve this issue, install the hotfix rollup package for Mediation Server that is described in the following Microsoft Knowledge Base article:
952780 (http://kbalertz.com/Feedback.aspx?kbNumber=952780/) Description of the update package for Communications Server 2007 Mediation Server August 2008
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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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REFERENCES
For more information about Communications Server 2007, visit the following Microsoft Web site:
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APPLIES TO
| • | Microsoft Office Communications Server 2007 Enterprise Edition |
| • | Microsoft Office Communications Server 2007 Standard Edition |
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| kbexpertiseadvanced kbprb kbtshoot kbuser kbsound kbcomm KB955996 |
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