provided by Star2Billing S.L.

The above as for global settings.

I think, it would be better to have this option as for country prefix basis. may be some destination having this issues and some not, so what to do in that case!!

thanks & regards.

Please realise this is a very poor workaround for your carrier's ineptitude, and should be avoided if at all possible. Rearranging the code to make this setting available on a per-rate basis is not impossible, but you'd need to be familiar with PHP & SQL. I doubt it's worth the effort. If a carrier can't even get something as obvious as answer supervision working correctly it indicates they don't have a clue about telecoms and VoIP.
Find a better carrier who doesn't defraud you on each call you make. If you don't vote with your wallet these shoddy carriers will proliferate, and then you'll be left with no option other than to pay these jokers to listen to their fake alerting whilst the outbound leg has probably already failed.
I thought we'd left the old, dark days of dodgy VoIP termination behind us years ago.

Hello!

Thank you very much for your response.

Termination gateway is quintum analog and there is answer supervision but it seems - there is still having some issue [sometimes]. calls answered right way after call get into the gateway[remote party didn't even answer the call], it was just ringing.

i'used some quintums with answer supervision, you need to setup fine the gateway to get away from troubles.

thank you for response. Answer supervision & timeout delay set to 5 minutes. So if its gets ringing for more than 5 min then the call will be declared as answer. Most of the time working fine.

Quintum support told might be machine getting very hot thats why happened, and told to upgrade the firmware. But it seems because of hitting.

Quintum's used to inspire similar rage in me. I'm glad to see the fine art of 'percussive maintenance' isn't lost on you.
Of course, you mean it was overheating.