[asterisk-users] Check if SIP is avaible to dial

[Jakub Syrek]

Hello.
Is it possible to check if SIP chanell is busy in asterisk?
I have N accounts from my provider and i can dial only one call per account.
I wanto my asterisk to check if first acount is busy, if yes try second and 
so on..
I was wondering if ChanIsAvail will suites my needs but i have read here
http://www.voip-info.org/wiki-Asterisk+cmd+ChanIsAvail that is not good.
Any other solutions?

Regards
Arkon