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Figure 5-19
REL with cause (two-message sequence)
(PRI)
Originating
user
Cause and treatment handling
A treatment is an in-switch event that indicates some sort of problem with
the routing or processing of a call (unless it is part of normal call
completion). Treatment codes trigger a set of pre-defined announcements or
tones that are audible to a user. A call terminates in a specified treatment
code for one of the following reasons:
Cause and treatment handling is used if a treatment is set in-switch by one of
the following:
DISC (cause)
REL
REL COM
The DMS-250 switch detects certain conditions that make it impossible
to complete the call (such as all trunks busy). The switch then prescribes
a treatment without reference to operating company translations.
The translations supplied by the operating company lead the call to a
specified treatment as part of a normal call completion process (for
example, an announcement to the originator of the call prior to call
completion).
through an error scenario (this includes mapping action codes from a
failure response to a treatment)
when one of the following message types are received by the DMS-250
switch (with causes not equal to 16):
— ISUP RELease with cause
— ISDN RELease with cause
— ISDN DISConnect with cause
— ISDN RELease COMplete with cause
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Call control procedures 5-29
Network
REL (cause)
REL COM
(ISUP)
Terminating
user
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