[Voip.ms] VoIP.ms internal extensions on OBi 202

I'm trying to modify my OBi 202 so it can use VoIP.ms's internal extensions feature. I tried to modify the OutboundCallRoute on the PHONE1 port by appending {(10x.):sp1}, but I get a busy signal after I dial the zero. When I moved it to the beginning of the string, the "10" worked, but the next digit caused a busy signal. Is there something I'm missing? Obviously numbers starting with 10 are not normally valid, but I thought appending this would've overridden solved the issue. My full OutboundCallRoute and DigitMap are as follows: DigitMap: (*97|[1-9]x?*(Mpli)|911|#|***|**1(Msp1)|**2(Msp2)|**6(Mvg6)|**9(Mpp)|(Mpli))OutboundCallRoute: {(10x.):sp1},{(*97):sp1},{(310xxxx):sp1},{([1-9]x?*(Mpli)):pp},{911:sp1},{(<#:>):ph2},{***:aa2},{(<**1:>(Msp1)):sp1},{(<**2:>(Msp2)):sp2},{(<**6:>(Mvg6)):vg6},{(<**9:>(Mpp)):pp},{(18(00|88|77|66|55|44)[2-9]xxxxxx):sp1},{(1[2-9]xx[2-9]xxxxxx):sp1},{(Mpli):pli}