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Event ID: 1087 Source: MSExchangeUnifiedMessaging

An outbound call to <destination> could not be established. The selected outbound gateway "<gateway>" returned the error: "<eror>". The Caller ID used for this call was '<ID>'. 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. You can also run diagnostic tests on your VoIP Gateway or IP/PBX hardware to make sure that the devices are operational. Additional information follows: .
As per Microsoft: "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". See MSEX2K3DB for information on fixing this problem.

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