Feature interaction 7-21
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
transmission required. (For more information on bearer capability, see
Chapter 4, “Message structure and functions.”)
The DMS-250 switch supports the following bearer capabilities for PRI
trunks:
• speech
• 56 kbit/s unrestricted
• 64 kbit/s unrestricted
• 64 kbit/s restricted
• 3.1 kHz audio
When terminating to a PRI, the BC information element passes unchanged
unless the call has been marked as data through translations.
Data calls
Any one of the following conditions indicate a data call:
• ISDN PRI bearer capability information element is set to 56 kbit/s, 64
kbit/s restricted, 64 kbit/s unrestricted, or N×64 calls (N=2 to 24).
• ISUP User Service Information parameter is set to 56 kbit/s, 64 kbit/s
restricted, 64 kbit/s unrestricted, or N×64 calls (N=2 to 24).
• A data call is indicated by one of the following:
— the DATA field in table TRKGRP, for the originating trunk
— the NCS response
— the DATA field in table ANISCRN
— received IMT information digits
Table 7-7 shows the data call dialed number interpretation.
Table 7-7
Data call dialed number
Type of dialed number
Interpretation
Datacall #56+7/10 digits
—end—
If the call is marked as data, the following rules apply:
• PRI origination
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