Hytera HP78X - Call with Signaling

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On the home screen, press and then rotate the Smart Knob to select the channel, and then press and hold the PTT
key.
6.7.2 Call with Signaling
On an analog channel with signaling, you can initiate a call to a specific contact on the channel. Do as follows:
1. Go to Menu > Contact, or press the preprogrammed Contact List key.
2. Select the contact.
3. Press and hold the PTT key or the preprogrammed One Touch Call/Menu key.