OA5 (10-points): Nextel Communications introduced cellular phone communications with walkie-talkie style service several years ago. Since then, The Open Mobile Alliance (OMA) is standardizing this technology as the push-to-talk over cellular (PoC) specification.
Research more about this technology and use a few paragraphs to describe how this technology works, what protocols are involved, what other vendors are offering, what would be its business applications, etc.
Responses should be comprehensive enough for full credit.
