Any proposed replacement must satisfy the following conditions showing it is a true improvement
a) be cheaper now and for the long term for customers
b) be more reliable
c) provide better 911 and other emergency services information
From the above
a) there will not be an initial upfront customer cost over and above current costs.
If it is to be cheaper overall the provider is to eat the up front cost and just delay reducing costs to the customer.
b) things like a touch tone charge are disallowed
c) it must not depend on power available at the customers site
d) digital features like allowing customers to add a digital description containing things like number of house occupants, ages, medial conditions to be sent along with a 911 call should be considered.