Oki 1.2 - Manual (Page 16)

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III III
Placing Calls
Placing Calls
Via an IP Network
Placing and receiving calls with the VoIP-TA unit are usually quite simple
and performed in the same way as conventional telephone networks. In
some cases however, the phone numbers to be used, may differ slightly
from the ones you used previously.
General Operation
Outgoing calls
Use a telephone that generates a Dual Tone Multiple Frequency (DTMF)
signal. Pick up the handset and dial a remote party’s telephone number.
Incoming call response
An incoming tone will be emitted from the telephone.
Disconnection
A telephone call can be disconnected by hanging up the handset onto the
telephone receiver.