SirDice: Yeah that was exactly how I was testing, but it wouldn't work for our situation because the dial string is being fed via a telnet session.
I did however get this to work properly with the US Robotics modem (<3 these things).
Well, after the testing was said and done, it is not a viable solution. The system and initializations and call process take about 30 seconds to complete the dial out. That is simply to long to wait for a viable solution for dialing out of the emergency call center.
I am now writing a "print" driver for the Avaya phone switch that will send the dial string directly into the phone switch.