Comdial Air Impact DSU, Manual

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Tone Or Voice Signaling
The system allows intercom calls to be tone signaled or voice signaled as the users
desire; however, the programmer uses system class of service programming procedures
to determine which signaling method the system will employed as the primary method.
Regardless of the programmer’s arrangement, telephone users can take action to use the
alternate method when they need it. See the paragraph titled Intercom Call Progress
Tones for a discussion of the intercom signaling tones.
Voice Announce Blocking
This feature allows station users to block voice announced intercom signaling by dialing
a code or pressing a programmable button programmed for that purpose. The
programmable button used to block voice signaling is enabled by station class of service
programming.
K
Key System/Hybrid Configuration
The system can operate as either a key system (KF designation) or as a hybrid system
(MF designation). In the past, this digital telephone system provided a hardware strap
that installers could move to distinguish between hybrid system and key system
operation; however, recent rulings by the FCC have eliminated the need for the hardware
strap. Therefore, whenever the programmer assigns lines to line groups, the system
automatically assumes the hybrid mode.
The KF and MF designations are equipment type categories as stipulated in FCC rules
and regulations, Part 68, and appear as part of the FCC Registration Number on the
equipment label. The installer must report the appropriate registration number to the
telephone company at the time of connection along with other FCC mandated
information. Operationally, the hybrid configuration allows dial access to (automatic
selection of) outgoing lines. The specific system feature that is enabled by the
multifunction (hybrid) configuration is Line Group (Including Dial Access). Since this is
a PBX type feature, it may incur a higher monthly tariff to the telephone company.
L
Last Number Redial
Each station is provided with a last number redial feature. This feature will save 32 digits
of the last outside number dialed. A newly dialed number will always automatically
replace a previously dialed number. Upon command, the system will choose a line and
redial the saved number. The system will first choose the prime line if assigned and idle.
If it is busy or unavailable, the system will choose any line assigned to idle line
IMI66–107 Digital Telephone System
Digital Telephone System Features A – 41