Ascotel IntelliGate 2025/2045/2065
Part 2 Call Routing 299
Exchange access authorization
The authorization to make outgoing calls to the public network can be granted or
restricted for each subscriber ("Exchange access authorization" setting in the sub-
scriber configuration).
This setting does not bar dialling into the public network with abbreviated dialling
and emergency numbers (see "Bypassing the digit barring", page 289).
Priority exchange allocation
This feature gives individual subscribers preferential treatment when they set up
outgoing connections. If a subscriber with priority exchange allocation sets up a
connection and all the B channels of the selected route to the network are busy,
one of the B channels will be cleared down and made available to the subscriber
(subscriber configuration setting: "External priority = emergency).
Fig. 2.73: Network access rights for subscribers with and without "Priority exchange allocation"
Example
In the event of an alarm, an alarm system independent of the PBX transmits a
message to an alarm headquarters via an ISDN card on an S user-network inter-
face (e.g. a text or a file).
Subscriber Config.
Ext. priority = normal
Subscriber Config.
Ext priority = emergency
A
B
If A wants to seize an exchange line,
no B channel will be available
B requests an exchange line
seizure; an existing connections is
disconnected on behalf of B
All B channels busy
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PBX
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