SIP 204 No Notification vs 600 Busy Everywhere
SIP 204 (No Notification) is a 2xx Success response, while 600 (Busy Everywhere) is a 6xx Global Failure response. 204 indicates that the request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request. In contrast, 600 means that the callee's end system was contacted successfully but the callee is busy and does not wish to take the call at this time. Unlike 486 (Busy Here), this is a definitive response.
Descripción
The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
Cuándo lo verás
When subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
Cómo solucionarlo
No fix needed. The subscription was accepted but there is no state change to notify about yet.
Descripción
The callee's end system was contacted successfully but the callee is busy and does not wish to take the call at this time. Unlike 486 (Busy Here), this is a definitive response.
Cuándo lo verás
When the callee has rejected the call on all devices. No other endpoints should be tried. The user is universally busy.
Cómo solucionarlo
Wait and try again later. No alternative contact points exist. The callee must become available on their own.
Diferencias clave
204 is a 2xx Success response, while 600 is a 6xx Global Failure response.
SIP 204: The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
SIP 600: The callee's end system was contacted successfully but the callee is busy and does not wish to take the call at this time. Unlike 486 (Busy Here), this is a definitive response.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 600 when when the callee has rejected the call on all devices. No other endpoints should be tried. The user is universally busy.
Cuándo usar cada uno
For 204 (No Notification): No fix needed. The subscription was accepted but there is no state change to notify about yet. For 600 (Busy Everywhere): Wait and try again later. No alternative contact points exist. The callee must become available on their own.