SIP 180 Ringing vs 504 Server Time-out
SIP 180 (Ringing) is a 1xx Provisional response, while 504 (Server Time-out) is a 5xx Server 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, 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).
विवरण
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.
जब आप इसे देखें
During call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
कैसे ठीक करें
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.
विवरण
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).
जब आप इसे देखें
When a proxy's request to a downstream server times out. The proxy itself is working, but the next hop is unresponsive.
कैसे ठीक करें
Check the downstream server's availability. Verify DNS resolution for the next-hop domain. Consider adjusting transaction timeout values.
मुख्य अंतर
180 is a 1xx Provisional response, while 504 is a 5xx Server 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 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 180 when during call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
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.
कब किसका उपयोग करें
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 504 (Server Time-out): Check the downstream server's availability. Verify DNS resolution for the next-hop domain. Consider adjusting transaction timeout values.