Cisco WS C4224V 8FXS - 200Mbps Ethernet Switch Software Configuration Manual page 187

Configuring the Eight-Port FXS RJ-21
Module
The Eight-port RJ-21 FXS Module is a high-density analog phone and fax relay
interface. By providing service to analog phones and fax machines, the eight
Foreign Exchange Station (FXS) ports emulate a Public Switched Telephone
Network (PSTN) central office (CO) or private branch exchange (PBX).
This section describes how to configure the eight-port FXS module on the
Catalyst 4224. This section contains the following topics:
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OL-2031-02
Eight-Port RJ-21 FXS Module User Interface Conventions, page 7-2
Configuring FXS Voice Ports, page 7-2
Fine-Tuning FXS Voice Ports, page 7-6
Activating the Voice Port, page 7-8
Sample Configuration, page 7-8
Catalyst 4224 Access Gateway Switch Software Configuration Guide
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