SIP 182 Queued vs 404 Not Found
SIP 182 (Queued) is a 1xx Provisional response, while 404 (Not Found) is a 4xx Client Failure response. 182 indicates that the called party is temporarily unavailable but the server has decided to queue the call rather than reject it. The call will be attempted when the callee becomes available. 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.
描述
The called party is temporarily unavailable but the server has decided to queue the call rather than reject it. The call will be attempted when the callee becomes available.
何时出现
In call center or queuing scenarios where the callee is busy but the system holds the call in a queue.
如何修复
Wait for the call to be dequeued. If queuing is not desired, configure the server to reject calls instead of queuing them.
描述
The user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
何时出现
When calling a number or SIP address that does not exist on the server. Different from 480 (user exists but is temporarily unavailable).
如何修复
Verify the SIP URI or phone number. Check if the user is registered on the correct domain. Ensure the domain is correct.
主要区别
182 is a 1xx Provisional response, while 404 is a 4xx Client Failure response.
SIP 182: The called party is temporarily unavailable but the server has decided to queue the call rather than reject it. The call will be attempted when the callee becomes available.
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 182 when in call center or queuing scenarios where the callee is busy but the system holds the call in a queue.
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).
何时使用哪个
For 182 (Queued): Wait for the call to be dequeued. If queuing is not desired, configure the server to reject calls instead of queuing them. 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.