SIP 204 No Notification vs 404 Not Found
SIP 204 (No Notification) is a 2xx Success response, while 404 (Not Found) 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, 404 means that the user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
คำอธิบาย
The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
เมื่อคุณพบเห็น
When subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
วิธีแก้ไข
No fix needed. The subscription was accepted but there is no state change to notify about yet.
คำอธิบาย
The user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
เมื่อคุณพบเห็น
When calling a number or SIP address that does not exist on the server. Different from 480 (user exists but is temporarily unavailable).
วิธีแก้ไข
Verify the SIP URI or phone number. Check if the user is registered on the correct domain. Ensure the domain is correct.
ความแตกต่างหลัก
204 is a 2xx Success response, while 404 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 404: The user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 404 when when calling a number or SIP address that does not exist on the server. Different from 480 (user exists but is temporarily unavailable).
ควรใช้อันไหนเมื่อไร
For 204 (No Notification): No fix needed. The subscription was accepted but there is no state change to notify about yet. For 404 (Not Found): Verify the SIP URI or phone number. Check if the user is registered on the correct domain. Ensure the domain is correct.