I was also searching the forums to find out how to use callCentric for 911 and GV for others. The following answer was good for another newbie, but I don't think I will ever understand it.
Physical Interfaces -> PHONE Port -> OutboundCallRoute:
{([1-9]x?*(Mpli)):pp},{(<#:>):li},{911:sp2},{**0:aa},{***:aa2},{(<**1:>(Msp1)):sp1},
{(<**2:>(Msp2)):sp2},{(<**8:>(Mli)):li},{(<**9:>(Mpp)):pp},{(Mpli):pli}
Does anyone know a simpler way to get this done?