SIP 181 Call Is Being Forwarded vs 428 Use Identity Header
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 428 (Use Identity Header) 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, 428 means that the server requires an Identity header to verify the caller's identity but it was not included in the request.
विवरण
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
जब आप इसे देखें
When the callee has call forwarding enabled and the request is being redirected to another number or device.
कैसे ठीक करें
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
विवरण
The server requires an Identity header to verify the caller's identity but it was not included in the request.
जब आप इसे देखें
In environments that enforce SIP Identity (RFC 4474) for caller authentication and spam prevention (STIR/SHAKEN).
कैसे ठीक करें
Add a valid Identity header signed by an authentication service. Ensure your STIR/SHAKEN infrastructure is properly configured.
मुख्य अंतर
181 is a 1xx Provisional response, while 428 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 428: The server requires an Identity header to verify the caller's identity but it was not included in the request.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 428 when in environments that enforce SIP Identity (RFC 4474) for caller authentication and spam prevention (STIR/SHAKEN).
कब किसका उपयोग करें
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 428 (Use Identity Header): Add a valid Identity header signed by an authentication service. Ensure your STIR/SHAKEN infrastructure is properly configured.