number of defined SIP trunks

I'm testing VicidialNow, nice work. I have successfully registered a Vitelity trunk. In vicidial how do you define the number of channels for the trunks you setup?
So if I want to have 5 channels on my Vitelity sip trunk how would I do that?
So if I want to have 5 channels on my Vitelity sip trunk how would I do that?