You do NOT need to register to make VRS calls. In fact, I would argue that it is more convenient NOT to have to register -- I just go to the website, put in the phone number, and dial! No need to memorize a login and password, wasting precious moments each time I need to make a call.
Case in point: SprintVRS, you can choose to login or just go and make a call. The login is for convenience of your personal preferences and options, i.e., your VCO number, frequently dialed numbers, and other personal information ready at a touch of a few buttons.
Logging in impacts your privacy. Hearing callers do not have a 3rd party listening in and identifying them unless they are actively wiretapped. Hearing people don't have to enter a login / password each time they want to call. Deaf people deserve the equal opportunity to enjoy privacy to make their phone calls without being identified by relay operators or interpreters.
Case in point -- I personally know several interpreters who work for different VRS providers. I have met several of their friends who know my face but probably don't know my name. If I call into VRS with my name, they will see my face, remember the name, and then possibly gossip my private conversation to those who may know me. Paranoid? No, it actually does happen in this kind of community, not all interpreters are totally professional and not all get fired for that breach of ethics.
You can give up privacy for convenience and/or security -- but I won't support anything less than leaving that choice up to each individual consumer.
