The IP gateway or IP-PBX “%1” did not respond to a SIP OPTIONS request from the Unified Messaging server. The error code that was returned is “%2” and the error text is “%3”.

Details
Product: Exchange
Event ID: 1088
Source: MSExchange Unified Messaging
Version: 8.0
Symbolic Name: PeerDidntRespond
Message: The IP gateway or IP-PBX “%1” did not respond to a SIP OPTIONS request from the Unified Messaging server. The error code that was returned is “%2” and the error text is “%3”.
   
Explanation

This Warning event indicates that the expected Session Initiation Protocol (SIP) options response status code 200 was not received by the computer that has the Unified Messaging server role installed. The response status code 200 is expected after the Unified Messaging (UM) server issues an SIP Option request to the SIP peers (VoIP gateway or IP-PBX). The SIP request is sent periodically as a mechanism to obtain the operational status of the SIP peers. After the UM server issues the request, the UM server waits for an SIP options response. If the UM server receives a response status code 200 within 2 seconds, the SIP peers are considered functional and without a connection delay between the server and the SIP peers. This event may be caused by one or more of the following:

  • The UM IP/VoIP gateway referred to a computer that has the UM Test Phone installed.

  • The UM IP/VoIP gateway referred to an SIP peer that does not exist.

  • There are SIP peer configuration issues.

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 to a computer that has the UM Test Phone installed, you can safely ignore the warning.

  • If the UM IP/VoIP gateway referred 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 vendors who support the VoIP gateway or IP-PBX to make sure that the device is operational and can return a 200 response status code when an SIP Option request is submitted.

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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