Keep legacy voice infrastructure connected without forcing a full endpoint replacement. Cisco’s modular 24 FXS port VoIP gateway is built for environments that still depend on analog phones, fax devices, and other FXS-based equipment while core communications shift to SIP and IP telephony. With 24 FXS ports and PVDM3-64 support, this gateway is suited to deployments where voice quality, capacity planning, and service continuity matter. It gives infrastructure teams a practical way to extend the life of existing analog assets while maintaining centralized control over call handling and voice integration. This model fits organizations that need to protect prior investments, reduce migration friction, and keep business-critical analog endpoints available during modernization projects. For enterprises with distributed sites, contact centers, or mixed voice estates, it provides the density and architecture expected from Cisco voice infrastructure. Use it when the requirement is not just connectivity, but predictable operation in a managed telephony stack. It is the kind of gateway selected when uptime, compatibility, and long-term support carry more weight than a low-cost replacement.