Expert Documentation

Chapter 8
Computer Telephony Integration (CTI) allows for the interaction of computer applications and
telephony features (for example, call centers and PC-based telephony). The Alcatel-Lucent
OmniPCX Office Communication Server provides a CTI application protocol called CSTA that
conforms to the EMCA CSTA Standard Phase 1. Using a client-server model, CSTA
implements a set of services for applications including:
- Service requests: Direct function calls which support a specific service.
- Service responses: Confirmation events or universal failures.
- Unsolicited Events: Provided when external events occur.
A list of specific applications supported by CSTA can be found on the Web under AAPP
(Alcatel-Lucent Application Partner Program).
8.6.1.2 Topology and Configuration
The CSTA protocol is delivered on an Ethernet TCP/IP link via the Alcatel-Lucent OmniPCX
Office Communication Server system CPU board. CSTA is available on all Alcatel-Lucent
OmniPCX Office Communication Server systems.
A CTI application can use CSTA for many different architectures including first-party and
third-party CTI. The following figure shows one possible application architecture: third-party
CTI in a client-server environment.
A CSTA link is made over TCP between the CTI application computer and the Alcatel-Lucent
OmniPCX Office Communication Server CSTA server on the PCX.
Alcatel-Lucent OmniPCX Office Communication Server CSTA supports multi-session CSTA:
several applications can open a CSTA session at the same time. The CSTA switching domain
is limited to the terminals and trunk lines directly connected to the Alcatel-Lucent OmniPCX
Office Communication Server.
The IP address, subnet mask, and gateway address of the Alcatel-Lucent OmniPCX Office
Communication Server CPU board must be correctly configured in OMC -> Hardware and
Limits -> LAN/IP Configuration -> Boards.
8.6.1.3 Capacities
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