Error messages :SIP/2.0 501 Not Implemented & SIP/2.0 404 Not Found

I have encounted a error reply with SIP/2.0.501 Not Implemented &SIP/2.0 404 Not Found at the same time. The original VOIP server is connected with ISP well. Once I switched to freepbx and used the original VOIP server as a outbound proxy, it resulted “SIP/2.0.501 Not Implemented &SIP/2.0 404 Not Found”.

All the local phone calls are fine. Is there any setting I should modify it ?

If one of these is a response to OPTIONS, that’s not a problem. FreePBX is just testing that the server is still alive and reachable; any error is an ok response for this purpose.

Find out what request(s) other than OPTIONS are eliciting the 404 and 501.

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