This isn't a problem, as the old 'voice' name will still work, and using the old domain name will automatically redirect visitors to the equivalent URL on the new domain name.

e.g., if I had a hypothetical site at http://e-voice.org.uk/example/ and I register the domain name www.example.com to use with it.
Then if anyone goes to the url http://e-voice.org.uk/example/about-us/ they will automatically be redirected to http://www.example.com/about-us/

And over time Google will use the new domain name in its search results instead of the old one.

Thanks

Voice Admin