65
Tone or Pulse Dialing Details
Each outside line can be set in the programming command to be a default tone (DTMF) or rotary
(pulse) dialing type. During speed dialing or redialing, digits will always be output in the tone
mode if the outside line is set to tone. If the outside line is programmed to dial in the pulse mode,
digits will be output as dial pulses until a star (‘*’) or a pound (‘#’) is encountered. Dialing will
then switch to the tone mode. The initial ‘*’ or ‘#’ digit will not be sent to the outside line.
In a simple connection from an extension to an outside line, extensions with ordinary phones are
treated differently than extensions with key telephones. An ordinary phone can send either DTMF
tones or pulses to the IPS. If the outside line is con
fi
gured for tone dialing, the DTMF digits from
the phone simply pass through the IPS to the outside line. If the phone sends pulses, the IPS will
receive the entire digit and then output digit pulses onto the outside line using the pulse mode
timing programmed by the System Manager (see “Pulse Dialing Timing”, page 96). Note that
when an extension invokes the Last Number Redial command, the IPS will output DTMF tones
since the outside line is con
fi
gured for tone mode dialing, even if extension originally dialed the
number using pulse dialing.
If the outside line is con
fi
gured for pulse dialing, the IPS can receive dial pulses from an ordinary
phone and will receive each entire digit and then output digit pulses onto the outside line. If the
phone is sending DTMF digits, the IPS will receive the DTMF digits and send dial pulses to the
outside line. Note that the DTMF tones sent from the phone will be passed through to the outside
line even though the IPS will also send dial pulses. The IPS will convert the DTMF tones into
dial pulses until a ‘*’ or a ‘#’ digit is encountered which will disable pulses from being sent to the
outside line for the duration of the call.
For extensions connected to key telephones, each key telephone has a TONE/PULSE key which
causes a light on the phone to be lit if the phone is in the pulse mode. In the pulse mode, digits
pressed are sent to the IPS in computer code and the IPS will send the equivalent dial pulses to
the outside line. Thus, unlike with an ordinary phone, DTMF tones are not passed through to the
outside line before the dial pulses are sent. In the tone mode, the phone sends the DTMF tones
which are simply passed through the unit to the outside line. Note that the default dialing mode
set for the outside line only affects speed dialing and redialing operations. If a key telephone
sends a DTMF tone to an outside line which is con
fi
gured to operate in the pulse mode, the IPS
will only pass the DTMF digit dialed and will not end dial pulses. The PAUSE key on the key
telephone can be pressed during dialing which will insert a 2-second pause during a subsequent
Last Number Redial.
Central Offi ce Lines – Advanced Topics
Central Offi
ce Lines – Advanced Topics
