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Issabel is an open-source IP PBX based on Asterisk, ideal for call routing, IVRs, and contact centers, with no licensing costs. Install it on Proxmox via netinstall (using an ISO or script), utilizing a bridged network for VoIP. Configure 5 IVRs by assigning options to extensions or inbound routes via the web interface.

Scalability: Supports 80 extensions without issues on the proposed hardware (compared to a minimum of 15 extensions with 500MB of RAM).
Security: Provides an unlimited private VPN for secure remote access.
Cost Savings: Open-source software means no licensing fees; automated backups prevent downtime.
Ease of Use: Features an intuitive interface for managing IVRs and generating CDR reports.