SIP 181 Call Is Being Forwarded vs 504 Server Time-out
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 504 (Server Time-out) is a 5xx Server 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, 504 means that the server did not receive a timely response from an external server it accessed while attempting to process the request. Different from 408 (client timeout).
الوصف
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
متى تراه
When the callee has call forwarding enabled and the request is being redirected to another number or device.
كيفية الإصلاح
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
الوصف
The server did not receive a timely response from an external server it accessed while attempting to process the request. Different from 408 (client timeout).
متى تراه
When a proxy's request to a downstream server times out. The proxy itself is working, but the next hop is unresponsive.
كيفية الإصلاح
Check the downstream server's availability. Verify DNS resolution for the next-hop domain. Consider adjusting transaction timeout values.
الفروق الرئيسية
181 is a 1xx Provisional response, while 504 is a 5xx Server 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 504: The server did not receive a timely response from an external server it accessed while attempting to process the request. Different from 408 (client timeout).
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 504 when when a proxy's request to a downstream server times out. The proxy itself is working, but the next hop is unresponsive.
متى تستخدم أيًا منهما
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 504 (Server Time-out): Check the downstream server's availability. Verify DNS resolution for the next-hop domain. Consider adjusting transaction timeout values.