A wireless LAN voice over IP telephone system
F.P. Heiman · 2002
This paper discusses the first wireless LAN phone based on voice over IP technology. This phone looks like an ordinary cell phone and it works like an ordinary cell phone, with one big advantage-one does not pay for calls between locations covered by your company's internal data network. With the addition of a gateway, one can make and receive calls over the public switched telephone network. It is like having a cell phone at work, without paying cell phone charges.