54 Voice API Programming Guide — June 2005
Call Progress Analysis
Table5 shows default tone definitions for SIT sequences used on DM3 boards. The values in the
“Freq.” column represent minimum and maximum values in Hz. “Time” refers to minimum and
maximum on time in 10 msec units; the maximum off time between each segment is 5 (or 50
msec). The repeat count is 1 for all SIT segments. N/A means “not applicable.”
The following considerations apply to SIT sequences on DM3 boards:
•A single tone proxy for the dual tone (also called twin tone) exists for each of the three
segments in a SIT sequence. The default definition for the minimum value and maximum
value (in Hz) is 0. For more information on this tone, see Section7.8.4, “Rules for Using a
Single Tone Proxy for a Dual Tone”, on page59.
•These tone IDs have aliases:
–TID_SIT_NO_CIRCUIT (TID_SIT_NC)
–TID_SIT_OPERATOR_INTERCEPT (TID_SIT_IC)
–TID_SIT_VACANT_CIRCUIT (TID_SIT_VC)
–TID_SIT_REORDER_TONE (TID_SIT_RO)
–TID_SIT_NO_CIRCUIT_INTERLATA (TID_SIT_NC_INTERLATA)
–TID_SIT_REORDER_TONE_INTERLATA (TID_SIT_RO_INTERLATA)
–TID_SIT_INEFFECTIVE_OTHER (TID_SIT_IO)
•Default SIT definitions can be modified, except for the following SIT sequences: TID_SIT_
ANY, TID_SIT_IO, TID_SIT_NC_INTERLATA, and TID_SIT_RO_INTERLATA. For more
information, see Section 7.8, “Modifying Default Call Progress Analysis Tone Definitions on
DM3 Boards”, on page 57.
•For TID_SIT_ANY, the frequency and time of the first and second segments are open; that is,
they are ignored. Only the frequency of the third segment is relevant. This catch-all SIT
sequence definition is intended to cover SIT sequences that fall outside the range of the
defined SIT sequences.
Table5. Special Information Tone Sequences (DM3)
SIT 1st Segment 2nd Segment 3rd Segment
Tone ID Description Freq. Time Freq. Time Freq. Time
TID_SIT_NC No Circuit Found 950/1020 32/45 1400/1450 32/45 1740/1850 N/A
TID_SIT_IC Operator
Intercept
874/955 15/30 1310/1430 15/30 1740/1850 N/A
TID_SIT_VC Vacant Circuit 950/1020 32/45 1310/1430 15/30 1740/1850 N/A
TID_SIT_RO Reorder
(system busy)
874/955 15/30 1400/1450 32/45 1740/1850 N/A
TID_SIT_NC_
INTERLATA
InterLATA No
Circuit Found
874/955 32/45 1310/1430 32/45 1740/1850 N/A
TID_SIT_RO_
INTERLATA
InterLATA
Reorder (system
busy)
950/1020 15/30 1310/1430 32/45 1740/1850 N/A
TID_SIT_IO Ineffective Other 874/955 32/45 1400/1450 15/30 1740/1850 N/A
TID_SIT_ANY Catch all tone
definition
Open Open Open Open 1725/1825 N/A