Preserve voice service across mixed infrastructure with a gateway built to bridge older telephony assets into SIP-based communications. The AudioCodes Mediant 800C with 1 E1/T1, 4 FXS, and 4 G is designed for environments that still depend on PSTN trunks, analog devices, and controlled migration paths to IP voice. With 1 E1/T1 interface, this model supports digital trunk connectivity for enterprise telephony deployments that need a direct path between legacy carrier services and VoIP systems. The 4 FXS ports provide attachment points for analog phones, fax devices, or other endpoint types that cannot be retired on day one. The 4 G designation in the product name reflects the configured gateway variant and helps distinguish this specific build within the Mediant 800C line. This is the kind of gateway chosen when uptime, compatibility, and migration control matter more than feature bloat. It fits where a smaller, purpose-built platform is preferable to overprovisioned hardware, especially in branch offices, distributed sites, and transition projects where voice services must remain stable during modernization.