Technical Helpweb

Ordering DID Telephone Service

IMPORTANT NOTE: This document is about the North American analog DID service. For information on using a digital DID service, often called 'DNIS', please consult Ordering T1-PRI (Primary Rate ISDN)

Analog DID

For DID Service, you must obtain from the telephone company:
 

When ordering DID telephone service, and before you connect DID channels to DID telephone lines, you must provide the telephone company with:

A source of -48V DC power.

Dialogic® Brooktrout® TR1034 Fax Boards do not use an external power supply, but instead get the DID voltage from the PCI bus. Once the DID line is activated, -48Vdc power must be continuous, or the telephone company may disconnect the DID service. The Brooktrout TR1034 DID Fax Board will supply the voltage to the DID line as long as the PC power is on and the Fax Board gets the voltage from the PC bus; the phone company should not put any voltage on the line from its end.

A specification of the DID service options you want.

Before you order DID service from your telephone company, find out which DID service options are available in your area and decide which option(s) you want. These service options define how your DID service will operate, and include:
 

Note 1: Trunk Type

As stated in the chart above, the phone company needs to give you a two-wire loop start trunk that works off battery reversal, meaning that the end user puts the 'battery', or the voltage, on the trunk, not the phone company.

Note 2: Service Type

The TR1034 Fax Board supports both wink-start and immediate-start service. Wink-start is generally used because it is faster and less prone to errors than immediate-start service.
 

Wink-Start:  The Brooktrout Fax Board expects to see the first DID digit within 5 seconds after the telephone is activated. Each successive digit must arrive within 5 seconds of the previous one. (The "wink" is a voltage reversal, lasting approximately 200ms, which the board sends to the telco side after that side has "seized" the line in preparation to send a call to the board; the "wink" tells the telco provider that it's OK to send the DID digits down the line.)

Immediate-Start:  The TR1034 Fax Board  expects to receive the first DID digit within 18 seconds after the telephone is activated. The maximum interdigit delay is 18 seconds. This service type may be easier to use for hand-dialed testing.

Your phone service provider must tell you if the service is wink or immediate, in order for you to set your fax software appropriately.
You will need to configure the service type using your fax software application, so that the Brooktrout Fax Board can function appropriately with the DID trunk.

 

Note 3: Digit Length

The DID service usually sends the last few digits of the dialed telephone number to the TR1034 Fax Board as a routing address. Your telco or service provider needs to tell you how many DID digits it is sending (typically it's the last 3 or 4 digits of the phone number, but not necessarily) so you can set up your fax application software appropriately; it is the fax application software that tells the TR1034 Fax Board how many digits to expect after it sees a call coming down the line.

Note 4: Signaling Type

Pulse tones are those generated by rotary-dial telephones. A series of pulses, simulating alternate on-hook/off-hook conditions, represents each dialed digit. Important: Some telephone service providers send pulse tones down a DID trunk to the TR1034 Fax Board. 

DTMF tones are those generated by touch-tone telephones. A different combination of two tones -  one high-frequency and one low-frequency - represents each of the twelve possible digits and characters on the touch-tone telephone keypad.

The Brooktrout TR1034 Fax Board supports DTMF only, it does not support pulse tones.


Other Information

Additionally, the telephone company may request other specific information on the Brooktrout Fax Board (the FCC Registration number, the service order code, the type of wall jack, and the facility interface code). This information is located on the bottom of the Brooktrout Fax Board, and is also given in the manual.

The FCC Registration number (TR1034 Fax Board):   US:5MWCN03ALP02

The Service order code:  9.0F

The type of wall jack required:  USOC-RJ-61X

The facility interface code:  02RV2-T
 

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First published: 05-Sep-2008
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