Intergration with CCM

Hello my brothers

I have changed from *now to Elastix…

i have the sip phones set up and registered…is it possible to intergrate with CCM off a sip trunk
I would like to be able to dial from the sip phone thru the call manager to the outside world and also have the sip phones dial call manager phones as well… it seems once I am able to get the calls through the Sip trunk… i update something to break it… iguess i need to know at first is it possible to intergrate with the call manager

thanks in advance