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Hello, I am getting an error when trying to do a provisionning Aastra 6755i SIP phone. I have the message "No Service" on the phone display and I can't make calls ("Call failed" message when trying to dial). I saw on the PBX logs that there is an error 404: SIP/2.0 404 Not Found Via: SIP/2.0/UDP X.X.X.X:5060;branch=z9hG4bK7c403344063151107;rport=5060;received=X.X.X.X From: <sip:105@X.X.X.X:5060>;tag=e493c84887 To: <sip:105@X.X.X.X:5060>;tag=056aef94b8 Call-ID: 66e2f3184e258c58 CSeq: 17040 REGISTER Content-Length: 0 That message means: The server has definitive information that the user does not exist at the domain specified in the Request-URI. This status is also returned if the domain in the Request-URI does not match any of the domains handled by the recipient of the request. But I'm sure about the user and the password I entered so I don't see what else it could be. If someone can help me, I'll be very grateful. Thanks, David