SIP 180 Ringing vs 413 Request Entity Too Large
SIP 180 (Ringing) is a 1xx Provisional response, while 413 (Request Entity Too Large) 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, 413 means that the server is refusing to process the request because the message body is larger than the server is willing to accept.
Descripción
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.
Cuándo lo verás
During call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
Cómo solucionarlo
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.
Descripción
The server is refusing to process the request because the message body is larger than the server is willing to accept.
Cuándo lo verás
When sending a SIP message with a body (SDP, XML, etc.) that exceeds the server's size limit.
Cómo solucionarlo
Reduce the size of the message body. For SDP, minimize codec offers or remove unnecessary attributes.
Diferencias clave
180 is a 1xx Provisional response, while 413 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 413: The server is refusing to process the request because the message body is larger than the server is willing to accept.
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 413 when when sending a SIP message with a body (SDP, XML, etc.) that exceeds the server's size limit.
Cuándo usar cada uno
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 413 (Request Entity Too Large): Reduce the size of the message body. For SDP, minimize codec offers or remove unnecessary attributes.