Voip, save money using THE killer open source app, Asterisk, an open source IP based PBX phone system. Utilize your high speed internet connection for your voice communications and cut your phone bill by 2/3rd's. The ability to have a call missed at your extension be forwarded to your cell or land line can be invaluable for people that need to stay in touch. Voice mail forwarded to email is another high end feature that is included in this low cost phone system.