Does anyone know if its possible to have more than 8 groups for the emergency call group? If there are more than 8 locations is there a work around for assigning a emergency call group so that the correct OLG is used for 911?

These outside locations are connected to the same PBX and use different outbound lines for each location? Are these IP phones?

I don't know about how to get additional emergency calling group, but you could use a central PRI and have the phones at each location push out a different caller ID for 911.