PLANET VIP-156 - Manual (Page 16)

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Test the scenario:
To verify the VoIP communication, please
1. Pick up the telephone on ATA A
2. Press the keypad: 2002 shall be able to connect to the ATA B
3. Then the telephone set in ATA B should ring. Please repeat
the same dialing steps on ATA B to establish the first voice
communication from ATA A