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Calls to a PSTN via the Cisco SIP Gateway Fail with a "400 Bad Request" Res

We have a Microsoft Real Time Communications Server and would like all of our MSN messanger clients to make SIP calls over a PSTN gateway. The Gateway has FXO and FXS cards and is a 36XX. When our clinet calls #1234 which is off the FXO card we get a "400 Bad Request" in the debug. We beleive the client is not formatting the SIP invite correctly.Has anyone worked with this before or gotten this error code. Could it be the way we are dialing from the MSN client We are just putting in the number 1234 should we format it as 1234@X.X.X.X (gateway ip address).

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Re: Calls to a PSTN via the Cisco SIP Gateway Fail with a "400 B

According to RFC 2543, INVITE message MUST have contact field with the headers indicating from which location the request is originating. The call is could be getting disconnected because the INVITE is not compatible with RFC2543. Also, take a look at bug CSCdx03555. It has been fixed in version 12.2(2)XB05.

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