Here's an update.
I believe ARS is currently being used although possibly not correctly. Even though my inter-digit timeout value in 26-01-02 is set to '30', taking more than 4 or 5 seconds between digits while dialing any outbound number gets a too-slow tone, ending the dialing process. It appears the way I have things setup, ARS is not queuing the number being dialed and then turning it over to the Telco, but instead as soon as dialing begins, our SV8100 gets a trunk line from the Telco and the Telco's time out value takes effect. What might I be missing to cause the ARS to queue a dialed number until completion or time-out before turning the entered number over to the Telco for a trunk to connect the call?
I realize that having the ARS queue phone numbers being dialed will add total dialing time, but it is probably worth it to control our inter-digit time out parameter as well as other possible benefits. I could ask our Telco to modify their time out value to us, but have not had luck with requests to them in the past. Any additional suggestions are certainly appreciated.