BusinessPhone Communication Platform 5.1
Facilities

## DISA With Password Control

## Definition

DISA (=Direct inward system access) with Password Control means that an external caller can dial via DTMF to a defined directory number. He/She has to dial his/her extension number and a password. After that he/she can make outgoing calls and the costs will be transferred to the individual extension number. Apart from making outgoing calls the external caller has the possibilty to control the individual external diversion function of his own extension number from external. See also document Individual External Diversion (269/15534-ASB 150 02 Uen).

## Use

DISA with Password Control is used for persons who work externally for a company and want to make business-calls, by using the companies exchange e.g. as long distance call router. The caller has only to pay the costs to the companies exchange the further cost will be assigned to his extension number or/and a special account code. Furtheron DISA provides fully control of the individual external diversion function of the own extension, especially useful when the caller does not want to get company calls presented after the working hours.

## Operation

After the external caller has dialled the DISA-directory number he receives back a voice prompt from the system. Via DTMF tones he has to enter his extension number. The access to the feature is only allowed if following items apply:

- definition of a namestring for the DISA extension in the internal directory book
- valid ACOS
- valid authorisation code (0000 is not allowed)

If all inputs are fullfilled, the external caller gets all the services related to his extension number in order to build up external calls. (Traffic group, TCD and Common abbreviated number COS.) Before the caller gets the internal dial tone to dial the desired external number, he gets a voice prompt to classify, if the call should be marked by an account code or not.

The external caller is then allowed to select a trunk route (which is defined in his Traffic group, to dial an external number, which is open in his TCD or dial a common abbreviated number, which is defined in the Common abbreviated number COS), or to dial the function code of the individual external diversion function.

The cost of the call will be transferred to the individual extension position.

In any situation where the external caller has been prompted by the voice announcements and the caller does not act within the registered timeout interval (4 seconds) the caller will receive the last voice anouncement again. If the caller does not act in the second try, he will be rerouted to a programmable exit-position (e.g. operator). If no exit position is defined the external caller will be routed to the reroute position of the relevant trunk.

An external caller who knows the procedure does not have to wait until all the voice prompts have been sent. The caller may enter further digits also during the voice prompts, which then will be disconnected immediately.

For people who often use the DISA function, there is no need to go through all voice prompts. In that case it is possible to dial all digits at once. If wrong digits are included in the string, digits are missing or there is a break in the digit string – longer then registered timeout – the external caller is routed back to the voice prompts. In that case all further digits of the digit string are ignored.

The DISA directory number is accessible externally for all members in the ASB 150 02 system – having a name defined within the interal directory book – independent of whether the system is configured as a multi-tenant system or not. To prevent a misuse of the DISA system in a multi tenant configuration, the caller is only allowed to use trunk lines related to his traffic group.

On the next page there is a diagram, which shows how DISA works with Password Control.

#### Delayed Automatic Answer for the DISA-function

See Delayed Automatic Answer (160/155 34-ASB 150 02 Uen).

Note

This procedure is described with the operator as exit position!

## Capacity

The number of external calls served by the DISA-function depends on the free resources of VMU-HD/MFU-voice-channels and free DTMF-receivers in the system. All extensions and the operator can be programmed to use the DISA-function.

## Limitations

- It is only possible to change the authorisation code internally via telephone.
- Authorisation code 0000 cannot be used for DISA feature.
- In order to use the DISA function, the user must have also an assigned name in the internal directory book beside the correct class of service .
- The DISA function can only be used by external callers.
- The DISA function can only be used for one external call. If the caller wants to make further calls he has to go through the whole procedure again.
- If you want to dial-in to the DISA system via a stored number including all DISA-Inputs (DISA- number + Extension number + Authorisation code + Account code), you have to take care that the system has enough time to identify all the different parts of the string numbers.

- Hint: Insert "wait-digits" in the stored string. You should enter 2 "wait-digits" at least after each number.

- The caller’s telephone must be equipped to send DTMF tones.
- When using Line Signals (command 1201) 06 (Australia, standard) or 21 (Standard with detection of disconn. tone) the maximum time the caller is connected to the desired party is 10 minutes.

## Programming

Commands executable only via BMS:

5425 |  | Create DISA with password

5525 |  | Delete DISA with password

5625 |  | Alter DISA with password

3081 |  | Access to DISA allowed?

8801 |  | DISA error reroute position

7801 |  | RSU-group reservation

This command is only executable via the telephone set.

4423 |  | DISA voice prompts

0101 |  | Facility COS

0102 |  | Traffic group

0103 |  | TCD-day COS

0104 |  | TCD-night COS

0105 |  | Common abbreviated number COS

## Equipment

The DISA function can be used with a VMU-HD or MFU board.

The DISA function requires available DTMF resources. DTMF registers are positioned on the following boards:

- BTU-D (8 DTMF receivers)
- REG (8 DTMF receivers)

Revision: F © Ericsson Enterprise 2003