SIP 204 No Notification vs 502 Bad Gateway
SIP 204 (No Notification) is a 2xx Success response, while 502 (Bad Gateway) is a 5xx Server 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, 502 means that the server, acting as a gateway or proxy, received an invalid response from a downstream server it accessed in attempting to fulfill the request.
Mô tả
The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
Khi bạn thấy mã này
When subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
Cách khắc phục
No fix needed. The subscription was accepted but there is no state change to notify about yet.
Mô tả
The server, acting as a gateway or proxy, received an invalid response from a downstream server it accessed in attempting to fulfill the request.
Khi bạn thấy mã này
When a SIP proxy receives a malformed or invalid response from the next-hop server. Common in interop scenarios between different vendors.
Cách khắc phục
Check the downstream server's health and configuration. Verify SIP message formatting between the two servers. Review network connectivity.
Sự khác biệt chính
204 is a 2xx Success response, while 502 is a 5xx Server Failure response.
SIP 204: The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
SIP 502: The server, acting as a gateway or proxy, received an invalid response from a downstream server it accessed in attempting to fulfill the request.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 502 when when a SIP proxy receives a malformed or invalid response from the next-hop server. Common in interop scenarios between different vendors.
Khi nào dùng cái nào
For 204 (No Notification): No fix needed. The subscription was accepted but there is no state change to notify about yet. For 502 (Bad Gateway): Check the downstream server's health and configuration. Verify SIP message formatting between the two servers. Review network connectivity.