[OpenSIPS-Users] why is request timeout a 4xx error?

Alexey Kazantsev kurgan-rus at inbox.ru
Sat Jul 16 11:58:20 UTC 2022

Hello Kingsley ,
maybe this is the reason:
In some cases, the response returned by the transaction layer
will not be a SIP message, but rather a transaction layer error.
When a timeout error is received from the transaction layer,
it MUST be treated as if a 408 (Request Timeout) status code
has been received. If a fatal transport error is reported by the
transport layer (generally, due to fatal ICMP errors in UDP or
connection failures in TCP), the condition MUST be treated
as a 503 (Service Unavailable) status code. [1]
[1]  https://datatracker.ietf.org/doc/html/rfc3261#section-
Anyway, a good starting point is to search «408» over the whole RFC 3261,
I’m sure you’ll find the answer using this method.
BR, Alexey
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