Maintain service for analog endpoints while moving voice traffic to SIP. The AudioCodes MediaPack 5xx MP504/4S/SIP provides four FXS voice interfaces in a compact gateway designed for telephony migration, branch continuity, and legacy device retention. It gives IT teams a practical path to keep analog phones and other FXS-dependent devices active without delaying broader UC modernization. This model fits environments where a full endpoint replacement is not justified, but service quality and operational continuity still matter. By bridging analog devices into an IP voice architecture, it supports phased refresh plans, controlled cutovers, and mixed infrastructure deployments. That makes it a strong fit for sites with limited analog counts, remote offices, or departments that still depend on established voice hardware. For procurement teams, the value is in precision: enough capacity for small analog footprints, without paying for unused ports. For infrastructure teams, the benefit is simpler migration planning and fewer disruptions to users who rely on legacy voice lines. The result is a gateway that earns its place in the network by extending the life of existing assets while aligning them with SIP-based communications.