[OpenSER-Users] Status code 408 returned by OpenSER when fr_timer expires; should it be 504?

[Anatoly Pidruchny]

Hello, Klaus,
>>
>> I noticed that OpenSER replies with status code "408 Request Timeout" 
>> when the fr_timer (tm module) expires. I am wondering if the response 
>> code "504 Server Timeout" would be more appropriate in this case. The 
>> status code 408 means that "the server could not produce a response, 
>> e.g., a user location, within the time indicated in the Expires 
>> request-header field. The client MAY repeat the request without 
>> modifications at any later time."; and the status code 504 means "the 
>> server did not receive a timely response from an external server it 
> Hello everybody,
>
> What if there is a 180 ringing response from the upstream server, but 
> no 200 OK within fr_timeout. Is this a "timely response"?
Well, for fr_timer, if there is any 1xx response from the upstream 
server then fr_timer is deactivated and fr_inv_timer is activated. Then 
fr_inv_timer is expecting the final response from the upstream server, 
for example, 200 OK. If it is not getting a final response, then I think 
yes, it is not getting a "timely response".
> Further, usually 5xx are server internal errors. Thus, If an upstream 
> timeout is triggered, IMO this is not a server error.
Well, 4xx are usually client errors. IMHO, when a fr_timer or 
fr_inv_timer expires in OpenSER, it is kind of more a server internal 
error, then a client error. After all, the client sent a perfectly valid 
request. So, the server should take the blame on itself rather then tell 
the client "you know what, you are wrong, not me".

Regards,
Anatoly.

>> accessed in attempting to process the request." It sounds to me that 
>> the description of the status code 504 better describes what happens 
>> in OpenSER when the fr_timer expires. Any comments? I am using 
>> OpenSER 1.2.x.
>>
>> Best regards,
>> Anatoly Pidruchny.
>>
>>
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