![]() Their phone alerts them that they have a Direct Connect call.The network routes the packets to the phone (or phones) of the person (or group) you are calling.If it is a group call, the network duplicates the digital voice packets for each phone in the group. The network then determines if it is a one-to-one or a group call.The network determines that this is a dispatch call (Direct Connect) instead of an interconnect call (a normal cell phone call).Your phone establishes a session with the Nextel iDEN-based network.You hit the Direct Connect button, which is configured with the number(s) of the person (or group) you are calling.When you make a Direct Connect call to someone, here's what happens: This person (or group) must use Nextel's service also. To enable Direct Connect, Nextel configures your phone to use the dispatch call service to reach the person or persons you specify. This way the system knows which direction the signal should be traveling in. The listener then presses their button to respond. ![]() PTT requires the person speaking to press a button while talking and then release it when they are done. Direct Connect relies on the proven technology of Push To Talk (PTT), commonly used in dispatch radio systems. A normal cell phone call uses two separate frequencies, one to send and one to receive, for each call while a Direct Connect call uses only a single frequency. The digital two-way radio service uses a half-duplex signal.
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