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Chapter 4: CallFinder Software Screens
Multi-Tech Systems, Inc. CF220 CallFinder User Guide 44
Channel Configuration Screen
“Channel Configuration: Channel 1 & Channel 2” Screen Field Definitions
Field Name Values Description
Max DID Digits 1-7
The number of digits that the telco supplies to the
DID line when an incoming call is received.
Default = 4.
Extension Port FXS or FXO Denotes the interface type of the port (Channel 1
or Channel 2). Each CallFinder port can be set
up either as an FXS port or as an FXO port. If a
port is configured as FXS, it would commonly be
connected to a PBX trunk line. If a port is
configured as FXO, it would commonly be
connected to a PBX station line.
Extension Mic Gain 0 to 255 The degree of amplification that the CallFinder
imposes on the voice signal of the phone
receiving the DID call. Default = 8
NOTE: This is a very sensitive parameter.
Change it only if necessary and then very
carefully. Misadjustment of this
parameter can cause unacceptable
degradation of performance.
Polarity A or B Orientation of DID battery voltage. Polarity of the
battery voltage on the DID line is very important
for the DID line to work properly. Since the line
comes from the telco as a twisted pair the
required polarity can only be determined through
trial and error. The modem is defaulted to
Polarity A. If an immediate busy signal is
received when dialing a DID number or if the call
is dropped shortly after connecting, then the
battery polarity is probably wrong and the
alternate battery voltage should be tried.
Default = A.
DID Start wink, immediate,
delay dial
Indicates the signaling method that the DID line
uses to indicate readiness to receive digits. The
telco must specify which ‘start type’ is to be used.
For Wink Start, the CallFinder detects the off-hook
condition. Then the CallFinder reverses battery
polarity for a specified time (140-290 ms; a “wink”) and
then becomes ready to receive DTMF digits.
For Immediate Start, the CallFinder detects the off-
hook condition initiated by the telco central-office call
and becomes ready to receive DTMF digits
immediately.
For Delay Dial, the CallFinder detects detects the off-
hook condition. Then the CallFinder reverses battery
polarity for a specified time (reverse polarity duration
has wider acceptable range than for Wink Start) and
then becomes ready to receive DTMF digits.