Huawei Technologies Co. Ltd Y340-U081 Manuale Utente

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Making a DC call
You can talk to another Direct Connect (DC) user or group 
of users by DC calls.
Enter a DC number in the dialer or choose a contact from 
People, and then press the PTT key to start a DC call. You 
can also create a DC Group and make a DC Group call.
Press the PTT key to answer an incoming DC call. Begin 
talking after your phone plays a chirp sound. Release the 
PTT key to listen.
End DC call
Answer 
DC call