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2. Nextel - Wikipedia

   en.wikipedia.org/wiki/NEXTEL

   Sprint had originally launched its own push-to-talk service, known as ReadyLink, which is based on SIP. Due to the difference in technology, users of the ReadyLink service were never able to make or receive push-to-talk calls with users of the iDEN technology. By 2009, Sprint began phasing out QChat to again focus on marketing iDEN devices.

3. Push-to-talk - Wikipedia

   en.wikipedia.org/wiki/Push-to-talk

   A significant advantage of PTT is the ability for a single person to reach an active talk group with a single button press; users don't need to make several telephone calls to coordinate with a group. Push-to-talk cellular calls similarly provide half-duplex communications – while one person transmits, the other(s) receive. This combines the ...

4. Sprint Corporation - Wikipedia

   en.wikipedia.org/wiki/Sprint_Corporation

   The iDEN network was originally deployed as a dispatch radio service and is unique in blending the half-duplex push-to-talk one-to-many broadcast capability of a walkie-talkie with the one-to-one private communication of a phone. Sprint later marketed "push-to-talk" services under the Nextel Direct Connect name.

5. AT&T Ready to Fight for Sprint's Push-To-Talkers - AOL

   www.aol.com/news/2012-09-18-att-ready-to-fight...

   It seemed like a good idea at the time (2005). Sprint Nextel (NYS: S) -- just plain old Sprint at the time -- looked at the success Nextel was having with its unique push-to-talk iDEN network and ...

6. Sprint Extends Push-to-Talk Capabilities to More Phones ... - AOL

   www.aol.com/news/2012-10-24-sprint-extends-push...

   The Sprint Direct Connect launch in October 2011 ushered in the next generation of PTT service from the company that pioneered push-to-talk. The service first offered broadband data capabilities ...

7. Sprint adds intrinsically-safe push-to-talk device to ... - AOL

   www.aol.com/news/2013-03-18-sprint-adds...

   Sprint adds intrinsically-safe push-to-talk device to Sprint Direct Connect portfolio Safety for industries working in gaseous hazardous areas OVERLAND PARK, Kan.--(BUSINESS WIRE)-- Sprint (NYS: S ...