In the coupling between the telecommunications and the DP world, a distinction is made between two CTI architectures: first-party telephony and third-party telephony.
First-party telephony is a physical link at terminal level, whereby the personal computer (PC) and the telephone are directly connected to each other. The personal computer can be connected to the telephone or to the PBX.TelephonyApplication Programming Interface (TAPI). logical connection is at the system level. The personal computers do not control the telephones, but the PBX via a telephony server. In this way, incoming and outgoing calls can be analyzed and assigned to the corresponding personal computers and telephones.