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Article ID: 973063 - Last Review: August 6, 2009 - Revision: 1.0
An Office Communications Server (OCS) 2007 user cannot answer a call from Public Switched Telephone Network (PSTN) after 5 minutes
When an Office Communications Server (OCS) 2007 user receives a
call from a public switched telephone network (PSTN) user, following issues occur:
- If the OCS 2007 user answers the call 5 minutes after receiving notification that there is an incoming call, the user receives the following error message:
- If the user answers the call 8 minutes after receiving notification that there is an incoming call, Office Communicator 2007 ends the call.
After the OCS 2007 user receives a call
from a PSTN user, while the call is connected, the OCS 2007 client sends a
"180 Ringing" response by using Session Initiation Protocol (SIP).
This response indicates that the call is in the PSTN calling state and
will be forwarded in the following way:
- From the client to OCS 2007 Standard Edition or to OCS 2007 Front-end Server.
- From OCS 2007 Standard Edition or to OCS 2007 Front-end Server to the Mediation Server.
- From the Mediation Server to the PSTN (external phone).
However, OCS 2007 Standard Edition or to OCS 2007 Front-end Server
does not forward the response to the Mediation Server after 5 minutes.
Therefore, if the user answers the call after 5 minutes after receiving notification that there is an incoming call, the user receives the error message that is mentioned in the "Symptoms" section and the call fails.
To work around this problem, the OCS 2007 user must answer the call within 5 minutes of receiving notification that there is an incoming call.
Microsoft
has confirmed that this is a problem in the Microsoft products that are listed
in the "Applies to" section.
APPLIES TO
- Microsoft Office Communicator 2007
- Microsoft Office Communicator 2007 R2
- Microsoft Office Communicator Phone Edition
- Microsoft Office Communications Server 2007 Standard Edition
- Microsoft Office Communications Server 2007 Enterprise Edition
- Microsoft Office Communications Server 2007 R2 Enterprise Edition
- Microsoft Office Communications Server 2007 R2 Standard Edition
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