The public switched telephone network (PSTN)
Calls come into the IR system from the public switched telephone network (PSTN). Calls from the PSTN may reach the IR system in one of three ways:
- A MultiVantage (DEFINITY) system receives the calls from the PSTN and passes them to the IR system through direct digital connections between the two systems.
- An IP-enabled DEFINITY or MultiVantage system receives calls from the PSTN, converts them to packet-based signals, and sends them to the IR system over a Local Area Network (LAN) connection.
- Calls come from the PSTN directly to the IR system through digital connections.
For successful voice response operations, all the connections described above, the DEFINITY or MultiVantage system, and the telephony network that supports them�including central offices�must be working and free from errors.
