Nortel DMS-250 - Route Advancing; Identifying Call Origin-Calling Number Delivery

Feature interaction 7-23
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Figure 7-7
Data call cause value handling
Table
Yes
No
Cause
Internal
treatment
to
cause
ISUP
Data
to
internal
treatment
FGD
origination?
call?
TMTMAP
Yes
No
Cause
parameter
or
cause
information
element
or
treatment
Cause
parameter
or
cause
information
element
Originating
agency:
NA PRI
NARS PRI
ISUP FGD
ISUP IMT
ISUP RLT
or
RSLR IMT
(standard,
option1,
option2)
Terminating
agency:
NA PRI
NARS PRI
ISUP FGD
ISUP IMT
ISUP RLT
or
RSLR IMT
(standard,
option1,
option2)
Route advancing
For all data calls, route advancing occurs if any of the following cause
values are received at a terminating DMS-250 switch (and therefore the
terminating agency is not an MCI ISUP IMT):
• 34—no circuit available
• 41—temporary failure
• 42—network congestion
• 47—resource unavailable
Identifying call origin—calling number delivery
The calling number information element identifies the origin of the call. The
calling number delivery service provides this number to the called party
(except when interworking from a PTS trunk).