SIP 204 No Notification vs 493 Undecipherable
SIP 204 (No Notification) is a 2xx Success response, while 493 (Undecipherable) 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, 493 means that the request body was encrypted with S/MIME but the server cannot decrypt it. The server may lack the necessary key or certificate.
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 request body was encrypted with S/MIME but the server cannot decrypt it. The server may lack the necessary key or certificate.
Khi bạn thấy mã này
When using S/MIME encryption for SIP message bodies and the recipient does not have the corresponding decryption key.
Cách khắc phục
Ensure the recipient has the correct S/MIME certificate and private key. Consider using TLS for transport-layer encryption instead.
Sự khác biệt chính
204 is a 2xx Success response, while 493 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 493: The request body was encrypted with S/MIME but the server cannot decrypt it. The server may lack the necessary key or certificate.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 493 when when using S/MIME encryption for SIP message bodies and the recipient does not have the corresponding decryption key.
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 493 (Undecipherable): Ensure the recipient has the correct S/MIME certificate and private key. Consider using TLS for transport-layer encryption instead.