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.
Описание
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.
Когда вы это видите
When a user is temporarily reachable at a different location, such as when traveling or using a different device.
Как исправить
Redirect the current call to the Contact URI provided, but keep the original URI for future requests.
Описание
The first outbound proxy does not support the SIP outbound mechanism (RFC 5626) that the UA is trying to use.
Когда вы это видите
When a UA configured for SIP outbound connects to a proxy that doesn't support the outbound option-tag.
Как исправить
Upgrade the outbound proxy to support RFC 5626, or configure the UA to not require outbound support.
Ключевые различия
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.
Когда что использовать
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.