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Chapter 4: CallFinder Software Screens

Multi-Tech Systems, Inc. CF220-DID CallFinder User Guide 44

“Channel Configuration: Channel 1 & Channel 2” Screen Field Definitions

Field Name Values Description

Max DTMF Digits 1-7 The number of digits that the telco supplies to the DID line when an

incoming call is received. Default = 4.

DID Start wink/delay dial,

immediate,

reverse on disconnect

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/Delay 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.

The Reverse on Disconnect setting allows the CallFinder to bring

fax service to the PBX by operating in conjunction with a Multi-Tech

fax server unit (FF-120/220/420/820). The Reverse on Disconnect

setting works with a PBX (3-Com) that uses line supervision for its

FXO ports. Line supervision monitors the battery voltage to identify

call disconnection (the battery polarity will reverse on

disconnection). This is not a true DID line type. In a DID system the

battery may reverse at several points - during the wink, to indicate a

connection, to busy out the line. In Reverse on Disconnect mode

the line polarity is reversed only when the call has been terminated

to indicate a disconnection.

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.

Dial Prefix Numeric string,

5 characters, max.

This is the digit that must be dialed to access an outside line (that is,

a line on the PSTN rather than extensions of the PBX or key

telephone system). Often a “9” or an “8” is used for this purpose.

Extension Port FXO,

FXS,

FXS Pass Through

Denotes the interface type of the port (Channel 1 or Channel 2).

Each CallFinder port can be set up either as an FXO port, as an

FXS port, or for FXS-Pass-Through. 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. If a port is configured for FXS-Pass-Through, it would

commonly be used to pass DTMF digits on directly to another

device (like a FaxFinder).

For FXS. The CallFinder rings the PBX. The PBX seizes the line.

The CallFinder waits n seconds before dialing the proper PBX

extension. Use a value of n = 1 second or more. Default = 2

For FXO. The CallFinder seizes the line from the PBX. Auto

Attendant Delay value (n) must be set to be greater than 0. A setting

of 0 would cause the PBX to miss digits. If n > 0, then the

CallFinder waits n seconds before dialing. Default: n = 2.

For FXS Pass Through. When set to FXS-Pass-Through, the

CallFinder simply conveys the DTMF digits received from the DID

line to the extension port. This mode differs from the standard FXS

mode in that it does not compare the incoming DID number to an

entry in the phonebook in order to find a new number to dial on the

extension port. Instead, it simply dials the same number on the

extension port that it received from the DID line. This setting is used

when a FaxFinder fax server is connected to the CallFinder.

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