SIP 181 Call Is Being Forwarded vs 437 Unsupported Certificate
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 437 (Unsupported Certificate) 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, 437 means that the server was unable to validate the certificate referenced by the Identity-Info header. The certificate may be self-signed or from an untrusted CA.
คำอธิบาย
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
เมื่อคุณพบเห็น
When the callee has call forwarding enabled and the request is being redirected to another number or device.
วิธีแก้ไข
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
คำอธิบาย
The server was unable to validate the certificate referenced by the Identity-Info header. The certificate may be self-signed or from an untrusted CA.
เมื่อคุณพบเห็น
When the signing certificate for SIP Identity validation is not trusted by the verifying server.
วิธีแก้ไข
Use a certificate from a trusted Certificate Authority. Ensure the certificate chain is complete and not expired.
ความแตกต่างหลัก
181 is a 1xx Provisional response, while 437 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 437: The server was unable to validate the certificate referenced by the Identity-Info header. The certificate may be self-signed or from an untrusted CA.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 437 when when the signing certificate for SIP Identity validation is not trusted by the verifying server.
ควรใช้อันไหนเมื่อไร
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 437 (Unsupported Certificate): Use a certificate from a trusted Certificate Authority. Ensure the certificate chain is complete and not expired.