Cisco Catalyst 4224 Specifikace stáhnout pdf (Strana 206)

Chapter 8 Configuring Survivable Remote Site Telephony

Overview of Survivable Remote Site Telephony

8-6

Catalyst 4224 Access Gateway Switch Software Configuration Guide

OL-2031-02

Cisco IP Phones periodically attempt to reestablish connections with the remote

Cisco CallManagers. When a connection is reestablished with a remote

Cisco CallManager, the Cisco IP Phones unregister from the local Catalyst 4224

with the SRST feature and register with the remote Cisco CallManager. The

connection to the primary Cisco CallManager at the remote office cannot be

reestablished if the telephone has active calls.

Figure 8-1 shows a branch office with several Cisco IP Phones connected to a

Catalyst 4224. The Catalyst 4224 is connected to the remote centralized

Cisco CallManager by the WAN and PSTN.

Figure 8-1 Branch Office Cisco IP Phones Connected to the Remote Central Cisco CallManager

Figure 8-2 shows that the WAN connection to the branch office is down and that

the Cisco IP Phones are able to make calls by being connected to the local SRST

Catalyst 4224. This Catalyst 4224 acts as a fallback Cisco CallManager. The

branch office Cisco IP Phones on the LAN network, connected to the PSTN, are

capable of making off-net calls outside the network using the Catalyst 4224s.

PSTN

network

Central

Cisco CallManager

Catalyst 4224

Fax

Telephone Telephone

58958

Cisco IP phones

PCs

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Cisco Catalyst 4224 Specifikace Strana 206