SIP 180 Ringing vs 484 Address Incomplete
SIP 180 (Ringing) is a 1xx Provisional response, while 484 (Address Incomplete) 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, 484 means that the Request-URI was incomplete. The server needs additional digits or information to route the call.
Description
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.
Quand vous le voyez
During call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
Comment résoudre
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.
Description
The Request-URI was incomplete. The server needs additional digits or information to route the call.
Quand vous le voyez
When dialing a partial phone number that the server cannot resolve. Common in PSTN gateway scenarios with overlap dialing.
Comment résoudre
Provide the complete destination address. Add missing digits or domain information to the Request-URI.
Différences clés
180 is a 1xx Provisional response, while 484 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 484: The Request-URI was incomplete. The server needs additional digits or information to route the call.
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 484 when when dialing a partial phone number that the server cannot resolve. Common in PSTN gateway scenarios with overlap dialing.
Quand utiliser lequel
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 484 (Address Incomplete): Provide the complete destination address. Add missing digits or domain information to the Request-URI.