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response strings (silent mode). This is not valid for outgoing calls, because then the convertor
modem should send response strings to the SOPHO-LAM.
So, the convertor settings for incoming and outgoing calls are different. Therefore at least two
convertor pools should be created.
The following selection mechanisms can be used to select the SOPHO-LAM convertor:
-
convertor group selection by group DNR;
-
individual convertor selection.
Convertor pool selection by group DNR is used to access a pool of convertors. The group
represents a convertor pool. When an internal party dials a group DNR it will be connected
to one of the convertors out of the pool. After dialling the group DNR the calling party has to
specify the destination information. This destination information is NOT handled by the
ISPBX; the ISPBX is transparent for the destination information dialled after the convertor
group DNR. So, the destination information must be handled on application level (end to end
communication between calling party and convertor). For example, when a modem supports
Hayes commands the destination information is specified using the ATD <destination DNR>
Hayes command (refer to the user manual of the modem).
Unlike `automatic convertor interconnection by CV', the IBSC of the internal calling party can
not be used for addressing the destination. The SOPHO-LAM convertor uses the IBSC of the
output of the convertor (ALC side) for addressing the basic service profile of the destination.
Individual convertor selection is used to access one single convertor. This way of selection is
especially for maintenance actions, such as changing the settings of the modem or SOPHO-
LAM. Normally only the maintenance engineer is allowed to use individual convertor
selection. A user should use convertor pool selection by group DNR.
A single convertor is selected by dialling the individual convertor DNR. This is done in the same
way as making an ordinary call.
After the convertor is selected, the calling party must specify the destination. This destination
information is NOT handled by the ISPBX. So, the destination information must be handled
on application level (end to end communication between calling party and convertor).
Just like the leased line configuration the settings of the convertor in a switched line
configuration can be changed using a maintenance terminal. Figure
Terminal connection for changing SOPHO-LAM settings (Switched Line).
configuration which can be used to change the SOPHO-LAM settings.
Figure 3-8 Maintenance
shows the
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