An error occurred while transferring the call to the phone number “%1”. The call ID is: “%2”.

Details
Product: Exchange
Event ID: 1136
Source: MSExchange Unified Messaging
Version: 8.0
Symbolic Name: CallTransferFailed
Message: An error occurred while transferring the call to the phone number “%1”. The call ID is: “%2”.
   
Explanation

This Warning event indicates that the Unified Messaging server did not transfer the incoming call to the telephone number that is listed in this event. This Warning event generally indicates that the Session Initiation Protocol (SIP) REFER command that is being issued by the Unified Messaging server cannot be accepted by a SIP peer (IP/VoIP gateway or IP/PBX). In some cases, the IP/VoIP gateway or IP/PBX may not be configured correctly to accept the SIP REFER command that is being sent by a Unified Messaging server. This event may be caused by one or more of the following:

  • The UM IP/VoIP gateway is forwarding an incoming call to a computer that has the UM Test Phone installed.

  • The UM IP/VoIP gateway is forwarding an incoming call to a SIP peer that does not exist.

  • There are issues with the SIP peer configuration.

For more information about UM IP/VoIP gateways, see Understanding Unified Messaging IP Gateways.

For more information about UM Test Phone, see Testing a UM Server with the UM Test Phone.

   
User Action

To resolve this warning, do one or more of the following:

  • If the UM IP/VoIP gateway referred the incoming call to an SIP peer that does not exist, delete the UM IP Gateway object from Microsoft Exchange. For more information, see How to Delete an Existing Unified Messaging IP Gateway.

  • Contact the vendor who supports the IP/VoIP gateway or IP/PBX to make sure that the device is working and that it supports the SIP REFER command.

  • Visit the Telephony Advisor for Exchange Server 2007 Web site. This Web site gives you IP/VoIP gateway configuration notes and files that you must have to correctly configure your organization’s IP/VoIP gateways to work with Exchange 2007 Unified Messaging.

  • If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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