User manual

6.5.3. What Is "Call-back"

In case of normal supervision call, the calling party, i.e. the Supervision Centre covers

data transmission costs. To avoid billing complications, the GSM gateway can establish

remote supervision connection on the account of the client’s GSM gateway. It is the so-

called call-back:

1. The Supervision Centre GSM gateway or modem “calls” the client’s GSM gateway.

2. The called GSM gateway identifies the Supervision Centre CLIP as a call-back request

and rejects the incoming call immediately. Therefore, this request is free.

3. Right after that, the called GSM gateway calls the Supervision Centre number that sent

the request. If unsuccessful, it retries several times later.

4. The Supervision Centre GSM gateway or modem waits for this call-back. Having

received it, it establishes data connection. Remote supervision is possible upon entering

of the valid service password.

6.5.4. Remote Supervision from 2N Supervision Centre

You need not configure anything for this service; all you have to do is to set parameter

930 to enable remote supervision. Necessary parameters are hidden (cannot be

programmed). Call-back is always used for this connection.

6.5.5. Overview of Remote Supervision Parameters

One common parameter enables / disables remote supervision, and four sets of

parameters follows:

• CLIP - number of remote supervision Centre,

• Call-back enabled / disabled,

• Number for call-back.

These four sets enables to make remote supervision call from up to four different sites.

Parameters are described in details in chapter 7.6 - Service parameters.