SIP 181 Call Is Being Forwarded vs 407 Proxy Authentication Required
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 407 (Proxy Authentication Required) 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, 407 means that the client must first authenticate with the proxy. The proxy returns a Proxy-Authenticate header with a challenge.
Description
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
Quand vous le voyez
When the callee has call forwarding enabled and the request is being redirected to another number or device.
Comment résoudre
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
Description
The client must first authenticate with the proxy. The proxy returns a Proxy-Authenticate header with a challenge.
Quand vous le voyez
When a SIP proxy requires authentication before forwarding the request. Similar to 401 but for proxy servers.
Comment résoudre
Resend the request with a Proxy-Authorization header containing valid credentials for the proxy.
Différences clés
181 is a 1xx Provisional response, while 407 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 407: The client must first authenticate with the proxy. The proxy returns a Proxy-Authenticate header with a challenge.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 407 when when a SIP proxy requires authentication before forwarding the request. Similar to 401 but for proxy servers.
Quand utiliser lequel
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 407 (Proxy Authentication Required): Resend the request with a Proxy-Authorization header containing valid credentials for the proxy.