My solution for 911 using Obi202 with Google Voice:
Check to see if your local 911 dispatch has a 10 digit emergency number as well.
Under Physical Interfaces -> PHONE Port -> OutboundCallRoute ->
add the following to the call route:
{(<911:XXXXXXXXXX>):sp1},
Enter after {([1-9]x?*(Mpli)):pp},
ALWAYS TEST USING A CELL OR OTHER NUMBER FIRST!
Go here to check if Smart911 is available in your community and complete your free profile:
https://www.smart911.com/