Cisco Systems UBR7225VXR specifications Authentication, Authorization, and Accounting Servers

Chapter 2 Preparing the Cisco uBR7225VXR Router for Installation

Provisioning the Cable Headend

Figure 2-2	Servers on an HFC Network
Cisco Network	Security	Log
Registrar	server	server	Cisco	Remote	Cisco 7500
DHCP/DNS server (optional)		(optional)	uBR7225VXR	access server*	series router

Internet

TFTP	Time-of-day
server	server

*A remote access server is required on an HFC network only when you want to offer VoIP using H.323 or telco return service.

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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.

	Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02		2-13