[OpenSER-Users] "noisy_ctimer" parameter in TM module

[Klaus Darilion]

Jiri Kuthan wrote:
> At 12:44 29/02/2008, Klaus Darilion wrote:
>> I vote for "remove" and have it "on" always.
>>
>> I never saw a reason for this parameter
> 
> Maybe underdocumentation is the point why many folks seem to be excited
> by removal :-)
> 
> Well -- with RFC2543 it could have been quite inconvenient for you to
> figure out that after say 90 seconds of early media (say on my favorite
> callee, German imigration office) you will be disconnected by a proxy
> server while stil in hope someone would answer for you. This is
> particularly annoying if the server in the path is playing a special
> purpose role (such as load-balancer) and surprises rest of the world
> with a CANCEL. this has been a real trouble in the field.
> 
> This obstacle should be in theory removed in RFC3261 which allows 18x
> to extend the proxy server timer.
> 
> (It goes back to the INVITE transaction as whole being misconcepted in 
> the SIP protocol, but that's frankly not worth fixing now.)
> 
> With that, my recommendation is to check behaviour of existing gateways
> before doing changes. (otherwise noisy_timer is undoubtably a confusing
> hack which if absent makes things simpler)

I think there is no easy way to solve this. A workaround would be to 
increase the fr_inv_timer in the reply route (e.g. after getting a 183 
response) - but I fear this would be difficult to implement.

regards
klaus