Case Study: Company Network
Boston
Headquarters
Zone Boston
T-1
Atlanta
Large Office
Zone Atlanta
128 K
256 K
Washington
Small Office
Zone Washington
10.128.1.2
Gatekeeper for
Atlanta Zone
Gatekeeper for
Boston, Washington,
and Providence Zones
10.64.1.2
(HSRP)
CallManager
10.128.1.3
T-1 Miami
Large Office
Zone Miami
10.144.1.2
Gatekeeper for
Miami Zone
CallManager
10.144.1.3
CallManager
10.64.1.3
CallManager
10.192.1.3
Router and Voice
Gateway
10.128.1.1
Router and Voice
Gateway
10.144.1.1
Router and Voice Gateway
10.64.1.1
HSRP Secondary for 10.64.1.2
Router
10.192.1.1
Router
10.64.1.6
New York
Medium Office
Zone NewYork
PSTN
768 K
Frame Relay
ISDN
Gateway
10.192.1.4
*1478258369#
IP Phone
Router
10.200.1.1
*1478258369#
IP Phone
*1478258369#
IP Phone
*1478258369#
IP Phone
Providence
Small Office
Zone Providence
Router
10.208.1.1
*1478258369#
The company has decided to place gatekeepers in their large offices (Boston,
Atlanta, and Miami), but not their small or medium offices (New York,
Washington, and Providence). Deploying gatekeepers in the larger offices will
offload call admission and bandwidth management from the headquarters
(Boston) gatekeeper to a local gatekeeper. Likewise, the medium and large sites
will have their own CallManager while the two small offices will use the Boston
CallManager. Since the New York office makes a large amount of videoconferences,
that site has an ISDN gateway to make videoconferences off of the corporate
network.This gateway is available for any site that needs to make a
videoconference with another company.