SIP 181 Call Is Being Forwarded vs 483 Too Many Hops
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 483 (Too Many Hops) 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, 483 means that the Max-Forwards header has reached zero, indicating the request has passed through too many proxies.
Descrição
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
Quando você o vê
When the callee has call forwarding enabled and the request is being redirected to another number or device.
Como corrigir
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
Descrição
The Max-Forwards header has reached zero, indicating the request has passed through too many proxies.
Quando você o vê
When a request traverses more proxies than the Max-Forwards counter allows (default 70). Often indicates a routing loop.
Como corrigir
Check for routing loops. If the path is legitimately long, increase Max-Forwards. Usually indicates misconfigured routing.
Diferenças principais
181 is a 1xx Provisional response, while 483 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 483: The Max-Forwards header has reached zero, indicating the request has passed through too many proxies.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 483 when when a request traverses more proxies than the Max-Forwards counter allows (default 70). Often indicates a routing loop.
Quando usar qual
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 483 (Too Many Hops): Check for routing loops. If the path is legitimately long, increase Max-Forwards. Usually indicates misconfigured routing.