SIP 302 Moved Temporarily vs 439 First Hop Lacks Outbound Support
SIP 302 (Moved Temporarily) is a 3xx Redirection response, while 439 (First Hop Lacks Outbound Support) is a 4xx Client Failure response. 302 indicates that the callee has temporarily moved to a different address. The client should retry the request at the Contact address but continue using the original URI for future requests. 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.
説明
The callee has temporarily moved to a different address. The client should retry the request at the Contact address but continue using the original URI for future requests.
このコードが表示される場合
When a user is temporarily reachable at a different location, such as when traveling or using a different device.
解決方法
Redirect the current call to the Contact URI provided, but keep the original URI for future requests.
説明
The first outbound proxy does not support the SIP outbound mechanism (RFC 5626) that the UA is trying to use.
このコードが表示される場合
When a UA configured for SIP outbound connects to a proxy that doesn't support the outbound option-tag.
解決方法
Upgrade the outbound proxy to support RFC 5626, or configure the UA to not require outbound support.
主な違い
302 is a 3xx Redirection response, while 439 is a 4xx Client Failure response.
SIP 302: The callee has temporarily moved to a different address. The client should retry the request at the Contact address but continue using the original URI for future requests.
SIP 439: The first outbound proxy does not support the SIP outbound mechanism (RFC 5626) that the UA is trying to use.
You encounter 302 when when a user is temporarily reachable at a different location, such as when traveling or using a different device.
You encounter 439 when when a UA configured for SIP outbound connects to a proxy that doesn't support the outbound option-tag.
どちらをいつ使うか
For 302 (Moved Temporarily): Redirect the current call to the Contact URI provided, but keep the original URI for future requests. For 439 (First Hop Lacks Outbound Support): Upgrade the outbound proxy to support RFC 5626, or configure the UA to not require outbound support.