Specifications

Chapter 8 Configuring Survivable Remote Site Telephony
Overview of Survivable Remote Site Telephony
8-4
Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
• Calling party ID (Caller ID/ANI) display
• Calling party name display
• Last number redial
• Maintaining local extension-to-extension calls when WAN link fails
• Maintaining local extension to public switched telephone network (PSTN)
calls when WAN link fails
• Maintaining existing calls when failed WAN link is reestablished
• Call transfer of local calls (blind transfer)
• Multiple lines per Cisco IP Phone
• Multiple line appearance across telephones
• Call hold (shared lines)
• Analog Foreign Exchange Station (FXS) and Foreign Exchange Office
(FXO) ports
• BRI support for EuroISDN
• PRI support for NET5 switch type
• Support for a maximum of 48 Cisco IP Phones
Note When the primary Cisco CallManager is restored, the displayed message is
removed and you can access all the previous functionality of the Cisco IP Phone.
Fallback Behavior
When the Cisco IP Phones lose contact with all primary, secondary, and tertiary
Cisco CallManagers, the phones re-home to the local SRST Catalyst 4224 to
provide the call processing capability required to place and receive calls.
(Re-homing is a major network change involving moving the local loop
termination from one Central Office wire center to another.) The Cisco IP Phone
lists the IP address of the local SRST Catalyst 4224 as the default Catalyst 4224
in the Network Configuration area of the Settings menu. This list supports up to
five default Catalyst 4224 entries; however, Cisco CallManager uses a maximum