SIP 181 Call Is Being Forwarded vs 438 Invalid Identity Header
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 438 (Invalid 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, 438 means that the server obtained the certificate from the Identity-Info header but the signature in the Identity header is invalid.
Descripción
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
Cuándo lo verás
When the callee has call forwarding enabled and the request is being redirected to another number or device.
Cómo solucionarlo
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
Descripción
The server obtained the certificate from the Identity-Info header but the signature in the Identity header is invalid.
Cuándo lo verás
When the cryptographic signature in the Identity header does not match the message content, indicating possible tampering.
Cómo solucionarlo
Regenerate the Identity header with a correct signature. Ensure no intermediary is modifying signed headers after signing.
Diferencias clave
181 is a 1xx Provisional response, while 438 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 438: The server obtained the certificate from the Identity-Info header but the signature in the Identity header is invalid.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 438 when when the cryptographic signature in the Identity header does not match the message content, indicating possible tampering.
Cuándo usar cada uno
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 438 (Invalid Identity Header): Regenerate the Identity header with a correct signature. Ensure no intermediary is modifying signed headers after signing.