SIP 181 Call Is Being Forwarded vs 422 Session Interval Too Small
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 422 (Session Interval Too Small) 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, 422 means that the request's Session-Expires value is too small. The Min-SE header in the response indicates the minimum acceptable session interval.
Deskripsi
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
Ketika Anda Melihatnya
When the callee has call forwarding enabled and the request is being redirected to another number or device.
Cara Memperbaiki
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
Deskripsi
The request's Session-Expires value is too small. The Min-SE header in the response indicates the minimum acceptable session interval.
Ketika Anda Melihatnya
When using SIP session timers (RFC 4028) and the proposed session refresh interval is below the server's minimum.
Cara Memperbaiki
Increase the Session-Expires value to at least the value indicated in the Min-SE header of the 422 response.
Perbedaan Utama
181 is a 1xx Provisional response, while 422 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 422: The request's Session-Expires value is too small. The Min-SE header in the response indicates the minimum acceptable session interval.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 422 when when using SIP session timers (RFC 4028) and the proposed session refresh interval is below the server's minimum.
Kapan Menggunakan Yang Mana
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 422 (Session Interval Too Small): Increase the Session-Expires value to at least the value indicated in the Min-SE header of the 422 response.