An outbound call to “%1” could not be established. The selected outbound IP gateway “%2” returned this error: “%3”. The caller ID for this call was “%4”. For help troubleshooting the SIP response error code that was specified in the event description, contact the vendors who support your IP gateway or IP PBX hardware. You can also run diagnostic tests on your IP gateway or IP PBX hardware to make sure that the devices are operating correctly. Additional information: “%5”

Details
Product: Exchange
Event ID: 1087
Source: MSExchange Unified Messaging
Version: 8.0
Symbolic Name: OutboundCallFailed
Message: An outbound call to “%1” could not be established. The selected outbound IP gateway “%2” returned this error: “%3”. The caller ID for this call was “%4”. For help troubleshooting the SIP response error code that was specified in the event description, contact the vendors who support your IP gateway or IP PBX hardware. You can also run diagnostic tests on your IP gateway or IP PBX hardware to make sure that the devices are operating correctly. Additional information: “%5”
   
Explanation

This Warning event indicates that the computer that is running the Unified Messaging server role did not establish an outgoing call to the IP/VoIP gateway. When the Unified Messaging (UM) server initiated the call, it issued a Session Initiation Protocol (SIP) request to the gateway. The gateway responded to the request with a 4xx, 5xx, or 6xx SIP response error code. The error code is specified in the event description. This event may be caused by a configuration error at the IP/VoIP gateway.

For more information about the SIP response codes, see RFC 3261 – SIP: Session Initiation Protocol at the Internet Engineering Task Force Web site.

The third-party Web site information in this topic is provided to help you find the technical information you need. The URLs are subject to change without notice.

   
User Action

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

  • Contact the vendors who support your VoIP gateway and IP/PBX hardware for help troubleshooting the SIP response error code specified in the event description.

  • Run diagnostic tests on your VoIP Gateway or IP/PBX hardware to make sure that the devices are operational.

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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