SIP 180 Ringing vs 404 Not Found
SIP 180 (Ringing) is a 1xx Provisional response, while 404 (Not Found) 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, 404 means that the user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
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 user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
जब आप इसे देखें
When calling a number or SIP address that does not exist on the server. Different from 480 (user exists but is temporarily unavailable).
कैसे ठीक करें
Verify the SIP URI or phone number. Check if the user is registered on the correct domain. Ensure the domain is correct.
मुख्य अंतर
180 is a 1xx Provisional response, while 404 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 404: The user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
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 404 when when calling a number or SIP address that does not exist on the server. Different from 480 (user exists but is temporarily unavailable).
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 404 (Not Found): Verify the SIP URI or phone number. Check if the user is registered on the correct domain. Ensure the domain is correct.