Cisco VG 224, VG 204 and VG 202 Analog Phone Gateways
The Cisco VG 224 (Figure 1), Cisco VG 204 (Figure 2), and Cisco VG 202 (Figure 3) are Cisco IOSĀ®
Software-based analog voice gateways. The Cisco VG224 is a high-density 24-port gateway, and the Cisco VG 204 and Cisco VG 202 are low-density 4 and 2 port gateways, respectively. These gateways connect analog phones, fax machines, modems, and speakerphones to an enterprise voice system based on Cisco Unified Communications Manager (Figure 4). 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, Cisco VG 204 and Cisco VG 202 with Cisco Unified Communications Manager Express to effectively augment an integrated services router (ISR) environment (Figure 5). Either topology environment will support business needs, ranging from high to low concentration of analog voice ports for modem calls, fax calls, and analog supplementary services.
Fax and Modem Connectivity
The Cisco VG 224, Cisco VG 204 and Cisco VG 202 support fax machines and modems. When using fax machines, they support Cisco fax relay, T.38 fax relay, and fax passthrough. Cisco or T.38 fax relay technologies allow transfer of faxes across the network with high reliability using less bandwidth than a voice call. All modems can be connected to the Cisco VG 224, Cisco VG 204 and Cisco VG 202 and will be transferred over the network using modem passthrough.
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