LevelOne VOI-7011 - Manual (Page 96)

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7. Upon successful SIP registration, the REG LED indicator
will be ON and the LCD will show registered <phone
number>.
Callings:
8. Pick up the phone, and you should hear a dial tone for
VoIP mode.
9. Press 1688# or 1688 to call the party with the registered
SIP phone number 1688. Note that # key will dial out the
number immediately. Dialling without # will not dial out
until the auto dial timer (default=5 seconds) elapsed.