SIP 181 Call Is Being Forwarded vs 403 Forbidden
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 403 (Forbidden) 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, 403 means that the server understood the request but is refusing to fulfill it. Authorization will not help. The request should not be repeated.
설명
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
이 코드를 보게 되는 경우
When the callee has call forwarding enabled and the request is being redirected to another number or device.
해결 방법
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
설명
The server understood the request but is refusing to fulfill it. Authorization will not help. The request should not be repeated.
이 코드를 보게 되는 경우
When the server policy denies the request regardless of credentials. Common for blocked numbers, restricted routes, or ACL violations.
해결 방법
Check server ACLs and routing policies. Verify the caller is permitted to make this type of call. Contact the server administrator if the block is unexpected.
주요 차이점
181 is a 1xx Provisional response, while 403 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 403: The server understood the request but is refusing to fulfill it. Authorization will not help. The request should not be repeated.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 403 when when the server policy denies the request regardless of credentials. Common for blocked numbers, restricted routes, or ACL violations.
언제 어떤 것을 사용할지
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 403 (Forbidden): Check server ACLs and routing policies. Verify the caller is permitted to make this type of call. Contact the server administrator if the block is unexpected.