SIP 182 Queued vs 439 First Hop Lacks Outbound Support
SIP 182 (Queued) is a 1xx Provisional response, while 439 (First Hop Lacks Outbound Support) 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, 439 means that the first outbound proxy does not support the SIP outbound mechanism (RFC 5626) that the UA is trying to use.
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 first outbound proxy does not support the SIP outbound mechanism (RFC 5626) that the UA is trying to use.
何时出现
When a UA configured for SIP outbound connects to a proxy that doesn't support the outbound option-tag.
如何修复
Upgrade the outbound proxy to support RFC 5626, or configure the UA to not require outbound support.
主要区别
182 is a 1xx Provisional response, while 439 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 439: The first outbound proxy does not support the SIP outbound mechanism (RFC 5626) that the UA is trying to use.
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 439 when when a UA configured for SIP outbound connects to a proxy that doesn't support the outbound option-tag.
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 439 (First Hop Lacks Outbound Support): Upgrade the outbound proxy to support RFC 5626, or configure the UA to not require outbound support.