When you configure
Voip.ms on sp1 check the "Use This Service for Emergency 911 Calls" box.
If you wish to use the 933 test, then make sure that 911|933 are both in your Phone Port DigitMap (911 should already be there). Also change your OutboundCallRoute so it looks like this:
Physical Interfaces > PHONE Port > OutboundCallRoute:
{([1-9]x?*(Mpli)):pp},{(911|933):sp1},{(<#:>):li},{**0:aa},{***:aa2},{(<**1:>(Msp1)):sp1},{(<**2:>(Msp2)):sp2},{(<**8:>(Mli)):li},{(<**9:>(Mpp)):pp},{(Mpli):pli}