SIP 100 Trying vs 470 Consent Needed
SIP 100 (Trying) is a 1xx Provisional response, while 470 (Consent Needed) is a 4xx Client Failure response. 100 indicates that the request has been received by the next-hop server and an unspecified action is being taken to process it. The UAC should expect additional responses. In contrast, 470 means that the request cannot be fulfilled because the source has not been granted consent by the recipient. Used in consent-based communications (RFC 5360).
Description
The request has been received by the next-hop server and an unspecified action is being taken to process it. The UAC should expect additional responses.
Quand vous le voyez
Immediately after sending an INVITE. The proxy has received the call and is searching for the callee. This is the SIP equivalent of a dial tone.
Comment résoudre
No fix needed — this is normal call setup behavior. If stuck on 100 Trying for too long, check network connectivity and proxy configuration.
Description
The request cannot be fulfilled because the source has not been granted consent by the recipient. Used in consent-based communications (RFC 5360).
Quand vous le voyez
When attempting to communicate with a user who has not granted permission for the calling party to reach them.
Comment résoudre
Request consent through a separate mechanism. The recipient must explicitly grant permission for future communications.
Différences clés
100 is a 1xx Provisional response, while 470 is a 4xx Client Failure response.
SIP 100: The request has been received by the next-hop server and an unspecified action is being taken to process it. The UAC should expect additional responses.
SIP 470: The request cannot be fulfilled because the source has not been granted consent by the recipient. Used in consent-based communications (RFC 5360).
You encounter 100 when immediately after sending an INVITE. The proxy has received the call and is searching for the callee. This is the SIP equivalent of a dial tone.
You encounter 470 when when attempting to communicate with a user who has not granted permission for the calling party to reach them.
Quand utiliser lequel
For 100 (Trying): No fix needed — this is normal call setup behavior. If stuck on 100 Trying for too long, check network connectivity and proxy configuration. For 470 (Consent Needed): Request consent through a separate mechanism. The recipient must explicitly grant permission for future communications.