SIP 204 No Notification vs 420 Bad Extension
SIP 204 (No Notification) is a 2xx Success response, while 420 (Bad Extension) is a 4xx Client 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, 420 means that the server did not understand the protocol extension specified in a Require or Proxy-Require header. The Unsupported header lists the unknown extensions.
Beschreibung
The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
Wann Sie es sehen
When subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
Wie man es behebt
No fix needed. The subscription was accepted but there is no state change to notify about yet.
Beschreibung
The server did not understand the protocol extension specified in a Require or Proxy-Require header. The Unsupported header lists the unknown extensions.
Wann Sie es sehen
When the request includes a Require header with SIP extensions that the server does not support.
Wie man es behebt
Check the Unsupported header in the response. Remove the unsupported extension from the Require header or make it optional via Supported.
Wesentliche Unterschiede
204 is a 2xx Success response, while 420 is a 4xx Client Failure response.
SIP 204: The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
SIP 420: The server did not understand the protocol extension specified in a Require or Proxy-Require header. The Unsupported header lists the unknown extensions.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 420 when when the request includes a Require header with SIP extensions that the server does not support.
Wann welchen verwenden
For 204 (No Notification): No fix needed. The subscription was accepted but there is no state change to notify about yet. For 420 (Bad Extension): Check the Unsupported header in the response. Remove the unsupported extension from the Require header or make it optional via Supported.