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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02
Chapter 2 Preparing the Cisco uBR7225VXR Router for Installation
Provisioning the Cable Headend
Figure 2-2 Servers on an HFC Network
Authentication, Authorization, and Accounting Servers
Authentication, authorization, and accounting (AAA) servers are essential to the network, because they
typically monitor usage for subscriber billing and record keeping. AAA features call upon a RADIUS
security server to help authenticate and monitor users’ access.
VoIP Gateways and Gatekeepers
To support digitized voice transmission on uBR7225VXR router using Cisco IOS Release 12.2(33)SCA
CMTS images, be sure to include VoIP gateways and gatekeepers in your configuration. Cisco IOS
Release 12.2(33)SCA supports VoIP by using the H.323 protocol. VoIP gateways convert IP-based voice
packets into standard PSTN voice traffic, making the process of placing calls over the IP network
transparent to users.
VoIP gatekeepers manage H.323-compliant gateways throughout the network. Gatekeepers also manage
traffic between their local cable system networks, as well as the networks of other VoIP gatekeepers.
VoIP SGCP Pass-Through
To support digitized voice transmission using Simple Gateway Control Protocol (SGCP), be sure to
include VoIP gateways and external call control elements (often referred to as call-agents) in your
configuration. Cisco IOS Release 12.2(33)SCA and later versions support VoIP communication using
the SGCP 1.1 protocol on uBR7225VXR. Just as with H.323 systems, VoIP gateways in an SGCP
environment convert IP-based voice packets into standard PSTN voice traffic, making the process of
placing calls over the IP network transparent to users.
Call-agents manage SGCP-compliant gateways throughout the network, allowing them to engage in
common channel signaling (CCS) over a 64-kbps circuit emulation service (CES) circuit.
Time-of-day
server
271657
Internet
TFTP
server
Cisco Network
Registrar
DHCP/DNS server
Cisco 7500
series router
Cisco
uBR7225VXR
Remote
access serve
r*
Log
server
(optional)
S
ecurity
server
(optional)
*A remote access server is required on an HFC network only
when you want to offer VoIP using H.323 or telco return service.