The Cisco VG 224 is a Cisco IOS Software-based high-density 24-port gateway for analog phones, fax machines, modems, and speaker-phones within an enterprise voice system based on Cisco Unified Call Manager. Having these devices tightly integrated with the IP-based phone system is advantageous for increased manageability, scalability, and cost-effectiveness. Commercial businesses can also use the Cisco VG 224 with Cisco Unified Call Manager Express to effectively augment an integrated services router (ISR) environment. Either topology environment will support business needs for a high concentration of analog voice ports for modem calls, fax calls, and analog supplementary services.