SIP 181 Call Is Being Forwarded vs 423 Interval Too Brief
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 423 (Interval Too Brief) 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, 423 means that the expiration time in the request is too short. The response contains a Min-Expires header indicating the minimum allowed value.
Açıklama
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
Gördüğünüzde
When the callee has call forwarding enabled and the request is being redirected to another number or device.
Nasıl Düzeltilir
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
Açıklama
The expiration time in the request is too short. The response contains a Min-Expires header indicating the minimum allowed value.
Gördüğünüzde
When a REGISTER or SUBSCRIBE request has an Expires value that is below the server's minimum. Common with aggressive keep-alive timers.
Nasıl Düzeltilir
Increase the Expires header value to at least the Min-Expires value from the response.
Temel Farklar
181 is a 1xx Provisional response, while 423 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 423: The expiration time in the request is too short. The response contains a Min-Expires header indicating the minimum allowed value.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 423 when when a REGISTER or SUBSCRIBE request has an Expires value that is below the server's minimum. Common with aggressive keep-alive timers.
Hangisini Ne Zaman Kullanmalı
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 423 (Interval Too Brief): Increase the Expires header value to at least the Min-Expires value from the response.