162 Voice API Programming Guide — June 2005
Global Tone Detection and Generation, and Cadenced Tone Generation
Table19. Standard PBX Call Progress Signals
Name Meaning Signal ID (tngencadp)
Dial Tone Ready for dialing CP_DIAL
Reorder Tone (Paths-Busy, All-Trunks-
Busy, Fast Busy)
Call blocked: resources
unavailable
CP_REORDER
Busy Tone (Slow Busy) Called line is busy CP_BUSY
Audible Ring Tone 1 (Ringback Tone) Called party is being alerted CP_RINGBACK1
Audible Ring Tone 21 (Slow Ringback
Tone)
Called party is being alerted CP_RINGBACK2
Special Audible Ring Tone 11 Called party has Call Waiting
feature and is being alerted
CP_RINGBACK1_CALLWAIT
Special Audible Ring Tone 21 Called party has Call Waiting
feature and is being alerted
CP_RINGBACK2_CALLWAIT
Recall Dial Tone Ready for additional dialing on
established connection
CP_RECALL_DIAL
Intercept Tone Call blocked: invalid CP_INTERCEPT
Call Waiting Tone 12 Call is waiting: single burst C_CALLWAIT1
Call Waiting Tone 22 Call is waiting: double burst CP_CALLWAIT2
Busy Verification Tone (Part A) Alerts parties that attendant is
about to enter connection
CP_BUSY_VERIFY_A
Busy Verification Tone (Part B) Attendant remains connected CP_BUSY_VERIFY_B
Executive Override Tone Overriding party about to be
bridged onto connection
CP_EXEC_OVERRIDE
Confirmation Tone Feature has been activated or
deactivated
CP_FEATURE_CONFIRM
Stutter Dial Tone (Message Waiting
Dial Tone)
Message waiting; ready for dialing CP_STUTTER_DIAL or
CP_MSG_WAIT_DIAL
1Either of the two Audible Ring Tones can be used but are not intended to be intermixed in a system. When using the
Special Audible Ring Tone (1 or 2), it should correspond to the Audible Ring Tone (1 or 2) that is used.
2The two Call Waiting Tones (1 & 2) can be used to differentiate between internally and externally originated calls. Call
Waiting Tone 2 is defined as a double burst in this implementation, although “multiple” bursts are permissible.