[Freeswitch-users] Freeswitch retries same call 4 times for no reason - incorrect treatment of timers by mod sofia?

[Victor Chukalovskiy]

Hello,

Looking for help or comments on this. Reproducible on the FS system that 
was updated about a month ago. Call scenario:

SIP call comes in on "a" leg, SIP call is attempted on the "b" leg. "b" 
leg replies "404".

Description of the problem:
FS tries same SIP destination 4 times on the "b" leg instead of doing it 
once. It does not respond "404" to the "a" leg until it finishes all 4 
attempts on the "b" leg. This occurs when "b" leg takes longer than 
usual to return "404".  For example, if "b" leg takes 1.3 seconds until 
we get "404", FS tries the call on "b" leg 3 more times. When this 
happens each consequent call attempt on the "b" leg is exactly 2 seconds 
apart from when the previous call attempt ends.

For comparison, in the same scenario and using exact same config, if "b' 
leg replies "404" sooner (e.g. within 0.3 seconds) FS does not retry 
this call on the "b" leg anymore. "404" is returned to the "a" leg 
instantaneously as it should be.

I suspect this is a bug in Sofia such that is somehow related to 500ms 
timer.

Is this known behavior? Do you need any more details to be able to 
verify or comment?

Thank you,
Victor