SIP 180 Ringing vs 406 Not Acceptable
SIP 180 (Ringing) is a 1xx Provisional response, while 406 (Not Acceptable) is a 4xx Client Failure response. 180 indicates that the UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end. In contrast, 406 means that the resource identified by the request is only capable of generating responses with content characteristics not acceptable according to the Accept header.
Beschreibung
The UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end.
Wann Sie es sehen
During call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
Wie man es behebt
No fix needed — the callee's device is ringing. If the call never connects after ringing, check the callee's device or call forwarding settings.
Beschreibung
The resource identified by the request is only capable of generating responses with content characteristics not acceptable according to the Accept header.
Wann Sie es sehen
When content negotiation fails — the server cannot produce a response matching the Accept header fields in the request.
Wie man es behebt
Review the Accept headers in your request and broaden the acceptable content types.
Wesentliche Unterschiede
180 is a 1xx Provisional response, while 406 is a 4xx Client Failure response.
SIP 180: The UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end.
SIP 406: The resource identified by the request is only capable of generating responses with content characteristics not acceptable according to the Accept header.
You encounter 180 when during call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
You encounter 406 when when content negotiation fails — the server cannot produce a response matching the Accept header fields in the request.
Wann welchen verwenden
For 180 (Ringing): No fix needed — the callee's device is ringing. If the call never connects after ringing, check the callee's device or call forwarding settings. For 406 (Not Acceptable): Review the Accept headers in your request and broaden the acceptable content types.