Trunk Circuit Descriptors - Digital E&M

Parameter

Description

Default Value

Number

Enter a number from 1 to 32 to uniquely identify each entry.

Blank

Call Collision Handling

Select whether "Normal" or "AT&T" method of glare handling is to be used.

AT&T

AT&T Call Collision Handling

If the AT&T method of glare handling is used, this parameter defines whether this end is to "Backoff" or "Nobackoff".

Backoff

Ignore Far End Disconnect

Select whether the trunks are to ignore or respond to a far-end disconnect signal.

No

Release Acknowledge Timer

Enter the amount of time the system will wait for a release acknowledgement from the far-end. Values range from 40 to 2400 UNITS. One unit equals 50 ms.

(80 UNITS)4 s

Address Signaling

Select whether the trunks use Loop or DTMF signaling.

• Note: When systems are connected via T1/D4, the address signaling must match on either end of the connection. If one end is programmed as Loop and the other as DTMF, the dialed digits will not be translated by the receiving system, and the call will fail.

Loop

Disconnect Timer

Enter the minimum length of a far-end disconnect signal. Allowed values are from 100 ms to 900 ms in 50 ms increments. This timer must be longer than the Flash Timer.

900 ms

Incoming Start Type

Select whether the trunk is immediate, delay dial, or wink start on incoming calls.

Wink

Dial Tone on Incoming Seize

Select if dial tone is to be returned when the trunk is seized by the far-end.

No

Outpulse Delay Timer

Enter the duration of the delay before outpulsing commences after a seizure. Allowed values are from 100 ms to 2000 ms in 10 ms increments.

800 ms

Outgoing Start Type

Select if the trunk is to provide wink start, immediate dial, delay dial, or delay dial with integrity check on outgoing calls.

Wink

Supervision Timer

Enter the expected duration of a supervision signal from the far-end. Values range from 200 to 12750 ms. 200 ms to 1000 ms is used for immediate dial trunks, 200 ms to 12750 ms for wink start trunks, and 4500 ms to 12750 ms for delay dial and delay dial with integrity check trunks. Values change in 50 ms increments.

200 ms

Maximum Wink Timer

Enter the maximum duration of the wink signal received from the far end. Values range from 300 to 4000 ms, and change in 50 ms increments. 300 ms to 450 ms is used for wink start, immediate or delay dial trunks, and 300 ms to 4000 ms for delay dial trunks with integrity check.

400 ms

Minimum Wink Timer

Enter the minimum duration of the wink signal received from the far end. Allowed values are from 50 ms to 150 ms in 50 ms increments.

100 ms

Guard Timer

Enter the amount of time for which a trunk will be unavailable for seizure following a release, to allow the trunk to clear before reseizing. Allowed values are from 100 ms to 6000 ms in 50 ms increments.

500 ms

Fake Answer Supervision After Outpulsing

Used to complete the audio connection after outpulsing if the trunk does not provide answer supervision. Select "Yes" to cause the system to provide answer supervision immediately after outpulsing. Select "No" to cause the system to wait for answer supervision from the far end.

No

Ignore Answer
Supervision

Specifies whether the trunk circuits are to expect answer supervision from the far end. Select "Yes" to indicate that answer supervision is not expected. Select "No" to indicate that answer supervision is to be provided from the far end.

No

Release Supervision Expected

Select "Yes" or "No" to indicate whether release supervision is provided from the far end.

Yes

Audio Inhibit Until Answer Supervision

Used to prevent a DTMF receiver, in line split mode, from being connected between the originating party and the outgoing trunk during the digit outpulsing phase of the call processing cycle. Select "Yes" to indicate that the audio path will only be connected after answer supervision has taken place. Select "No" if a DTMF receiver, in linesplit mode, IS to be connected between the origination party and the outgoing trunk during digit outpulsing.

Yes

Far End Connection

Not applicable to this release.

Main PBX

Facility Type

Select "Yes" or "No" to indicate if the far-end facility is digital or a combination of digital and analog.

Combination

Minimum Flash Timer

Enter a value between "100" and "250" milliseconds, in increments of 10 milliseconds, to define the minimum flash time required in order for the peripheral software to detect a recall.

250 ms

Maximum Flash Timer

Enter a value between "200" and "800" milliseconds, in increments of 10 milliseconds, to define the maximum flash time required in order for the peripheral software to detect a recall.

200 ms

Drop Digit Rcvr for Outgoing Audio Before Ans Sup

This option allows DTMF digits to be sent from a telephone to the CO without having to wait for or fake answer supervision. It also allows the system to provide exact call detail through SMDR by using the answer supervision signals provided by the CO.

Select "Yes" for credit or calling card calls, calls that require pin numbers, and equal access calls. For example, if the CO recognizes a calling card call, it will send either a tone or recorded message. Once the user enters a valid card number, the call proceeds and answer supervision is returned when the called party answers.

No

Flash Timer

Enter a value between "200" and "700" milliseconds in increments of 50 milliseconds. This timer specifies the duration of the single trunk flash or each of the flashes for a double trunk flash. For a double flash, the time between flashes is hard-coded at one second.

300 ms

AB Signaling Bit Inversion

Select "Yes" to indicate that the trunk is a Private Line Automatic Ringdown trunk.

No

Manual Ringdown Trunk

Select "Yes" to indicate that the trunk is a Manual Ringdown The Manual Ringdown feature used with Voice Trader Application Platform (VTAP) provides hotline-type connection without dialing between Turret devices used in security and commodity trading. (MRD) trunk for use with the Voice Trader Application Platform (VTAP).

No