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2. Introduction to PBXs and KTSs
or separate wires (e.g., RS-232). Because of its versatility, out-of-band signaling
is often the selected method.
CT equipment comprises a PC containing a Dialogic
®
PBX Integration Board and
a software application. Dialogic
®
PBX Integration Boards and Dialogic
®
APIs
enable the creation of applications that are tightly integrated with a PBX and that
can take advantage of call control elements.
Below is a list of PBX features and functions currently supported by Dialogic
®
PBX Integration Boards. Note, however, that KTSs and hybrid systems may
support only some of these features.
• supervised call transfer
• blind call transfer
• caller ID
• called party ID
• positive disconnect supervision
• in-band signaling
• out-of-band signaling
• read display messages
• “press” programmable keys
• message waiting indication
2.1. Supervised Call Transfer
A supervised transfer is a method of transferring an incoming call to another
extension, making use of call progress results (i.e., answered, busy, and ring no
answer). This type of transfer can be likened to the following manual operations:
1. Answer a call.
2. Place the caller on hold.
3. Press the transfer key (hook flash).
4. Dial the destination number.
5. If the destination party answers, hang up (the transfer is complete).
6. If the destination party does not answer, switch back to the caller and provide
choices to leave voice mail, select another extension, or hang up.
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