Genesis Of PTT
For quick, single-question-and-answer conversations, a conventional phone call takes too long. Playing voice-mail phone tag makes it all the more tedious.
In contrast, PTT functions like a walkie-talkie, with an immediate response. All communication is carried out in a one-at-a-time (half-duplex) manner, in which one person talks while the other listens. Although not as fluid as a full-duplex telephone conversation, this model of communication is fine for a quick dialog. But Nextel's PTT service has some fundamental pitfalls--iDEN's circuit-switched technology requires that PTT conversations share a portion of the cell node's precious telephone bandwidth used for regular phone calls. And enterprise phone system integration is a distant dream; Nextel's service lets customers reach only fellow Nextel customers.
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Enter SIP PTT
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