I may have just answered my own question again. I found a way, but please let me know if you know of a cleaner way:

user = event:getHeader("VM-User")

domain = event:getHeader("VM-Domain")

api = freeswitch.API();

from = api:executeString("user_data " ..user .. "@" .. domain .. " var outbound_caller_id_number")

to = api:executeString("user_data " .. user .. "@" .. domain .. " param vm-notify-sms")

This should get me what I need to send the text.

Steve