"Google Voice" is a telecommunications service offering enhanced: voicemail, forwarding, conferencing, etc. -- coordinated across all of your voice devices and managed on the web.
Google Voice is a telecommunications service offering:
- Coordination across all your land and mobile phone devices.
- Enhanced voicemail.
- Call forwarding, conferencing, and call screening.
- Integration with Gmail.
- Reduced rates on some calls.
- An optional universal number for all of your phones.
More information:
- "Google Voice" article at Wikipedia.
- "Google Voice" features.
- "Google Voice" home(ish) page (doesn't require a login).