Enterprise VoIP Network Architecture: Filial vs Matriz Setup with PSTN & VPN Integration #3400988 (License: Personal Use)

The diagram depicts a hybrid telephony infrastructure where the filial site uses Cisco CallManager Express with IP handsets and VPN connectivity, while the matriz site relies on a PABX system supporting analog phones and four simultaneous FXS/FXO lines. Both sites interconnect via PSTN (E1 trunks), Internet (for data and VoIP), and encrypted VPN tunnels for secure voice/data transport. Key components include routers/switches, IP and analog endpoints, and centralized call control.

This image is used in technical documentation, IT training materials, or telecom solution pages to explain enterprise-grade voice network design-especially for organizations deploying multi-site VoIP with legacy analog integration. It serves users seeking to understand hybrid PBX deployment, branch connectivity, or migration strategies from PSTN to IP telephony.