Using “D” Messages for Layer 3 • 8-9 •
The H.110 Basic Rate ISDN Board
For SETUP messages
N Normal Alerting
D Distinctive Alerting
S Special Alerting
I Intercom Alerting
R Reminder Ring
F Alerting Off
For other messages
D Dial Tone
R Ringback
N Network Congestion/Reorder
B Busy Tone
C Confirmation Tone
W Waiting Call
F Tones Off
While most ISDN Station sets support different ring patterns and tones for
the various codes, sets from different manufacturers do not necessarily use
the same tone patterns for the different alerting codes.
8.4 SPIDs & Endpoint Identifiers
Service Profile Identifiers or SPIDs are numbers that are programmed into
terminals and sent to the network switch to identify a specific terminal
device so that it can be associated with the features subscribed to by that
terminal. The SPID is usually an 11 to 14 digit number of which the first
10 digits are normally the Directory Number for the interface. The
remaining digits are used to identify the different terminal devices on the
interface. In the NI-1 specification, one or two SPIDs can be associated
with a Basic Rate Interface. The SPIDs can be associated with two pieces
of terminal equipment, or the same TE can have two SPIDs. Some CO
switches require that one SPID be used for Speech or Audio calls and the
other SPID be used for Data calls.
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