VRS in the United States is funded by the Universal Service Fee that every US citizen pays as part of their telephone bill. Directed by the FCC, NECA disperses payment to a handful of VRS providers that are legally allowed to bill the NECA fund.
This is why Canadian citizens cannot be serviced by US based VRS providers.
As for Point-to-Point calling:
The US iTRS database that holds all deaf phone numbers and their associated IP address (in the case of videophones) or associated Instant Messaging Screen Names (in the case of TRS clients). Unfortunately, only US based VRS providers have access to the US iTRS database. This means that you can't call your deaf friends by phone number, but it really only looks up their IP address anyway: if you have their IP address, you can still make an H.323 IP call from an H.323 videophone and reach your deaf friends directly.
Not all hope is lost, however. There may be some good news for you:
The Canadian Radio-television and Telecommunications Commission (CRTC) has mandated that national IP Relay be set up by July 21st, 2010, as well as VRS to a couple of different regions of Canada:
Bell Canada and Telus will each set up their own regional VRS. Telus will serve B.C. and Alberta. Bell will serve Ontario and Quebec.
A summary:
http://www.fndc.ca/headlines/2008_vrs_canada_decision.pdf
The actual CRTC order:
Broadcasting and Telecom Regulatory Policy CRTC 2009-430
The Canadian VRS system is _not_ national, however, so you're still on your own if you're not in one of those regions.
As far as I am aware, these independant Canadian VRS systems do NOT have access to the US iTRS database. This means that Canadian deaf customers cannot call Point-to-Point to US deaf customers using a phone number.
That's not to say you can't still call your friends if you know their IP addresses. That may still work, assuming H.323 is used on the Canadian videophones. There is no guarantee of that.
It really is unfortunate that there isn't more of an international solution to deaf videophone calling.