Computers can be connected to the PBX to provide extension users with access to advanced features such as pop-up display of caller information, computer-based speed dialing, etc. These features are made available by running customized Computer Telephony Integration (CTI) software, available from Panasonic (PC Console, PC Phone, etc.) as well as third-party software vendors.

CTI can be achieved in two ways:

1)	First Party Call Control
2)	Third Party Call Control

First Party Call Control

A PC is connected to a digital proprietary telephone (DPT) which supports an optional USB Module. Each PC acts independently; it is not necessarily connected to a server.
The PBX directs a call to the extension as normal, then depending on the CTI software being used the PC can control the DPT (answer calls, transfer calls, etc.) or monitor the status of the extension (display the billing information or customer profile of the caller when a call is received, etc.).

Third Party Call Control

Each extension's PC and a server form a LAN, and the server only–not each PC–is connected directly to the PBX's USB port (located on the MPR card) or to an optional CTI-LINK card.
When using Third Party Call Control, the server controls the "client" PCs. Depending on the CTI software being used, the server can determine how calls are distributed to the extensions of the PBX and can also control what information is sent to the PCs when their extensions receive calls.

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Application Programming Interface (API)/Protocol
Software used for CTI must support the following protocol(s):

Type

API/Protocol

First Party Call Control

•	ECMA CSTA Phase 3

Third Party Call Control

•	ECMA CSTA Phase 3
•	TAPI 2.1

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Operating system requirements for PCs and servers vary by the CTI software being used. Refer to your CTI software documentation for more information.

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Only one server can be connected to a PBX.