Another Idea
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How about an 800 call-back number that works in the USA and Canada?
You call it, and the 800 response says:


  • your number is "555-555-5555"
  • VOIPo, press 1 if this is correct (You press one.)
  • Please hang-up (You hang up)
  • (Your phone rings, you answer, and its the Remote Access service now connected.)


Archive that CID so next call, it merely says "VOIPo, please hang-up"

Maybe that is more cost effective in general?
Being a call-back, it minimizes the Toll-Free costs.