SIP 181 Call Is Being Forwarded vs 404 Not Found
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 404 (Not Found) is a 4xx Client Failure response. 181 indicates that a proxy server may send this to indicate that the call is being forwarded to a different set of destinations. In contrast, 404 means that the user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
Beschreibung
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
Wann Sie es sehen
When the callee has call forwarding enabled and the request is being redirected to another number or device.
Wie man es behebt
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
Beschreibung
The user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
Wann Sie es sehen
When calling a number or SIP address that does not exist on the server. Different from 480 (user exists but is temporarily unavailable).
Wie man es behebt
Verify the SIP URI or phone number. Check if the user is registered on the correct domain. Ensure the domain is correct.
Wesentliche Unterschiede
181 is a 1xx Provisional response, while 404 is a 4xx Client Failure response.
SIP 181: A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
SIP 404: The user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 404 when when calling a number or SIP address that does not exist on the server. Different from 480 (user exists but is temporarily unavailable).
Wann welchen verwenden
For 181 (Call Is Being Forwarded): No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings. For 404 (Not Found): Verify the SIP URI or phone number. Check if the user is registered on the correct domain. Ensure the domain is correct.