7-22 Feature interaction
297-2521-106 Standard 23.01 March 2001
— If no BC was received, the BC of SPEECH is sent with the outgoing
SETUP message.
— If the BC is 3.1 kHz, the BC of SPEECH is sent. If the originating
BC is 56 kbit/s, 64 kbit/s, or 3.1 kHz, the BC is passed unchanged.
• non-PRI origination
— If the DIGITAL field in the trunk group is set to YES, the BC of
SPEECH is sent with the outgoing SETUP message.
— If the DIGITAL field in the trunk group is set to NO, treatment is
applied to the call.
• terminating over a CCS7 IMT
A data call that originates over a PRI facility with a BC information
element of 56 kbit/s or 64 kbit/s (restricted or unrestricted) terminating
over a CCS7 IMT is terminated only over a CCS7 IMT marked
DIGITAL in table TRKGRP. If an appropriate CCS7 IMT cannot be
found, the call is blocked. The call is routed to GNCT treatment.
• terminating over non-IMT trunks
No restriction is applied to calls destined to non-IMT trunks.
Data call cause handling
For all data calls, the DMS-250 propagates the non-normal cause parameter
or cause information element received in one of the following messages
from the terminating agency:
• ISUP RELease with cause
• ISDN RELease with cause
• ISDN DISConnect with cause
• ISDN RELease COMplete with cause
The non-normal cause parameter or cause information element received is
propagated unchanged to the originating agency when
• the call is a data call
• the terminating agency has received one of the previously listed
messages (and the cause value is not equal to 16 “normal clearing”).
Data call cause handling requires that office parameter
CSE_TRTMT_ENHANCEMENTS is set to “N.”
Figure 7-7 shows cause value handling for data calls.
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