Proxima, Libra firmware ver. 2.12.xx
rev. 2.12.01
4.1.3 ISDN trunk lines
MODES: None, Announcement, DISA, IVR
The server working in those modes supports digital trunk lines in a manner similar
to that employed in the case of analogue trunk lines. The digital ISDN BRA trunk
line may handle two calls at the same time (this is due to the distribution of ISDN-
BRA access into two B channels, both of which may be separately used as a traffic
channel). By the same token, the ISDN-PRA (30B+D) line may handle up to 30
calls at the same time.
Using the DDI (Direct Dial-In) service:
The server makes direct dialling of the extension number possible for the outside
party. In order to use this function, the following conditions must be met:
the server is connected with the telecom operator via the ISDN line;
the user has a group of DDI numbers assigned by the local
telecommunications operator;
Using the computer program, the server installer should programme the server to
handle DDI numbers (menu: Call distribution → MSN/DDI incoming calls).
If an outside party wishes to call a server user using the DDI function, the
procedure is as follows:
Dial the DDI external number of an extension, e.g. 585558888.
The outside party will hear a ring-back tone – if the selected extension is
idle (it may also be engaged – in such a case, the extension user hears a
tone offering an external call in the background).
The outside party will hear an engaged tone – if the selected extension is
engaged and it has the “no waiting call indication” function on.
The outside party will hear an "unavailable" tone – if the DDI traffic setup
within the server is incorrect or if there is no such number.
4.1.4 Automatic Call Distribution – ACD
The server offers the ACD (Automatic Call Distribution) function based on the
identified CLIP (Calling Line Identification Presentation) number. Using this
function, the server will route incoming calls, e.g. to selected extension users,
based on the ACD tables.
Full configuration of the ACD tables is carried out in the computer program
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