Installation manual

Function 2: CO lines IVX C-Class Installation Manual

E.4

Function 23: CO line parameters

Function 231: System CO line receive volume

Many variables can affect the volume of the CO lines. Weak lines can reduce the system’s ability to

properly detect DTMF dialed by an outside caller. Conversely, “hot” lines can cause DTMF distortion

and/or increase the opportunity for message talk-off (i. e., messages being cut off before completion).

This function can be used to adjust the gain of the receive volume of the CO lines system-wide.

Range: 0–12 (lowest to highest gain, respectively). Default: 10.

Function 232: Line disconnect / open loop interval

You can set the lines to detect the open loop interval (if available from the CO) and disconnect more

quickly. This will also allow the system to drop abandoned calls from hold.

Since open loop intervals generated by the CO may vary in duration, use this function to program

IVX C-Class to less than or equal to the CO open loop interval.

If this programmed value is set unnecessarily low, IVX C-Class may falsely interpret static or a

momentary loop break as an open loop and disconnect a caller on hold. If this value is set too high,

the system may not detect a valid open loop signal for fastest call processing.

Range: 1–255 (10–2,550 ms) (or 0 to turn off open loop detect). Default: 6 (60ms).

Function 24: Caller ID

This function activates the Caller ID capability in the IVX C-Class system — if the customer has ordered

Caller ID service from the Telco. The IVX C-Class system will display the caller’s name (or “

OUT-OF-AREA,”

etc.) for incoming calls or messages (or show the Caller ID number if the CO only provides a number).

Default: Disabled.

Esi-Dex and auto callback

— This is accomplished by pressing REDIAL or ESI-DEX either during

message playback or after an Esi-Dex search. Caller ID numbers received from the CO are 10 digits long

(and include the area codes for local calls). In auto callback, the IVX C-Class system assumes all

calls are to be long distance and will automatically add a “1” prefix to the 10 digits to be dialed.

A table of local area codes can be programmed to indicate that calls to those area codes are to be

dialed as local calls. Select one of the following two types of local dialing for each area code entered:

• Local 7 — Local calls that can be dialed only as seven-digit numbers (the IVX C-Class system strips

the area code before dialing and will not add a “1” prefix).

• Local 10 — Local calls that can be dialed only as 10-digit numbers (the IVX C-Class system will not

add a “1” prefix).

For an area code that can be called as a long distance number (with a “1” prefix) and as a local number

(10 digits without a prefix), decide which case is the more prevalent and then add to or exclude from the

area codes exception list accordingly. Thus, some of these calls must be made manually.

Note: Since the Caller ID information is transmitted from the CO during the silence between the first and

second rings, enabling this feature will delay the answer of inbound calls until the second ring.

Esi-Dex isn’t available on the 12-Key Digital Feature Phone.