Specifications

Chapter 1 Product Overview
VoIP Gateway
1-6
Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
• Protocol Independent Multicast (PIM) and Internet Group Management
Protocol (IGMP) snooping
• Per-port broadcast, multicast, and unicast storm control that prevents faulty
end stations from degrading overall system performance
• Inline 48-volt DC power
• MAC-based port-level security to prevent unauthorized stations from
accessing the switch
Survivable Remote Site Telephony
As enterprises extend IP telephony from central sites to remote offices, it is
important to provide backup redundancy at the remote branch office. The
Survivable Remote Site Telephony (SRST) software feature on the Catalyst 4224
automatically detects a failure in the network and uses Cisco Simple Network
Automated Provisioning (SNAP) to provide call-processing backup for the IP
phones in the remote office.
The Catalyst 4224 provides call processing for the duration of the failure and
ensures that the phones remain operational. Upon restoration of the WAN and
connectivity to the network, the system automatically shifts call-processing
functions to the primary Cisco CallManager cluster. Configuration for this
capability is done only once in the Cisco CallManager at the central site.
VoIP Gateway
Voice Over IP (VoIP) receives voice traffic at one location, converts it to TCP/IP
packets for the benefits of toll-bypass, and transports the packets across the WAN
to their destination.
To facilitate the migration to VoIP, the Catalyst 4224 includes an integrated
high-density eight-port FXS module. These FXS ports can connect analog
phones, modems, and fax machines to the Catalyst 4224.
The Catalyst 4224 supports a wide range of voice interface cards with the most
popular signaling protocols. Supported protocols and interface types include
T1-PRI, E1-PRI, T1-CAS, E1-CAS R2, ISDN BRI, and FXO.