Push to talk by Nextel had it's own allocated bandwidth. Bandwidth = MONEY, so they shut down PTT and sold the bandwidth. In the manufacturing plant where I wo

Push to talk by Nextel had it's own allocated bandwidth. Bandwidth = MONEY, so they shut down PTT and sold the bandwidth. In the manufacturing plant where I worked, we went from being almost able to understand people on Nextel PTT to completely unable to understand people with the software implementation. The plant has since switched to local walkie talkies with repeaters - with Nextel you could easily start chatting with anyone else on the network, pretty much anywhere.