PRIORITY CALLS CALL SERVER : TELEPHONE FEATURES
Ed. 044/4 Réf. 3EH 21000 BSAA
PRIORITY CALL MADE BY A USER
ADDITIONAL INFORMATION
- The bank alarm device cannot be connected to a Z interface behind a Reflexes station.
- Several priority calls can be set up simultaneously
- A priority call may fail if the public exchange is saturated, if the destination is busy or if it collides
with an incoming call during the "setup" phase.
- The event "R_PRIORITY_CALL" – specifying the number of the station on which the call was released
– is generated in the PABX history table whenever a call is released to make way for a priority call.
- The bank alarm device's directory number cannot be a private one.
- To avoid the system releasing a basic call on a B channel belonging to the trunk group assigned
to the bank alarm device, when a B channel is free in another trunk group, it is advisable to con-
figure all the accesses on a single trunk group.
- All calls made from an S0 terminal are considered as priority calls if a priority level >0 is defined
Is there a free
channel in the trunk
group assigned to
the alarm device
Priority call
The system looks for a B
channel to release (*)
NO
YES
Search for busy B
channel with lowest
priority
Can one of the B
channels be
released?
NO
YES
The system releases the
communication (**)
Is the release
request accepted
by the network?
YES
NO
The system waits for the
call to be released by the
network
The priority call is set up
Call failure
Busy channel B
found with low
priority
NO
YES
(*) only a basic call (i.e. not a call which is on hold or camped on, nor a call which is engaged in a three-party call, etc...).
(**) the released line cannot be assigned to a user who has left an automatic call-back request on a busy trunk group
The trunk group can also include analog lines (TL)
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