The number you dialled 416-443-3600 was rejected by the service provider. Reason is 480

[curt]

When I dialled 416-443-3600, it rang several times and then a system women said:

"The number you dialled 416-443-3600 was rejected by the service provider. Reason is 480."

What is reason 480?

When I dialled the same number on Fongo Mobile app, it rang several times and then it disconnected.

[Liptonbrisk]

SIP error code 480 means that the destination you're trying to reach, 416-443-3600, is temporarily unavailable.
https://www.ietf.org/rfc/rfc3261.txt

480 Temporarily Unavailable

"The callee's end system was contacted successfully, but the callee is
currently unavailable (for example, is not logged in, logged in but
in a state that precludes communication with the callee, or has
activated the `do not disturb' feature). The response MAY indicate a
better time to call in the Retry-After header field. The user could
also be available elsewhere (unbeknownst to this server). The reason
phrase SHOULD indicate a more precise cause as to why the callee is
unavailable. This value SHOULD be settable by the UA. Status 486
(Busy Here) MAY be used to more precisely indicate a particular
reason for the call failure.

This status is also returned by a redirect or proxy server that
recognizes the user identified by the Request-URI, but does not
currently have a valid forwarding location for that user."

[Liptonbrisk]

By the way, that number doesn't appear to be working at all (at least not at the moment). No one can call it.

I'm getting 404 with other service providers, which means "not found". That is, the number doesn't exist.

Call Ended (404 Not Found)

https://www.ietf.org/rfc/rfc3261.txt

"404 Not Found

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."