Direct PTT - The Nextel T320 is the full package. This model is a Smart- Radio with PTT & 2-Way Manage your entire fleet from your palm with full GPS Tracking and Mapping.
Walkie-talkie voice chat is coming - back - Komando.com
Motorola i560 Rugged Nextel Phone Announced - ecoustics.com
It's no accident that Apple chose a yellow icon for its walkie-talkie feature. I dug out my old (2002ish) Nextel with PTT (push to talk). It was all the rage back then... :
When Phones Were Fun: NEXTEL - YouTube
Throwback Tech: Old school cell phones - Electronic Products
Nextel i530 Cell Phone Review - BayReviews
Throwback Tech: Old school cell phones - Electronic Products
Nextel Launches the Motorola i850 Camera Phone
LOT OF 4 MOTOROLA I365 NEXTEL WALKIE TALKIE CELL PHONES | eBay