Cisco 7246 Hardware Installation Guide - Page 29

Chapter 1 Cisco uBR7200 Series Overview Supported System Configurations Overview IP Telephony Services The Cisco uBR7200 series supports the transmission of packetized voice and facsimile traffic over the cable and IP backbone network. Figure 1-7 on page 1-11 shows a typical two-way configuration involving Voice-over-IP (VoIP) telephony services. Figure 1-7 Two-Way IP Telephony Network Example Cisco uBR7200 series Service provider backbone Gateway/PSTN Cisco uBR7200 series HFC cable plant Gatekeeper or calling agents Remote cable modem Policy server HFC cable plant Remote cable modem 25659 Calling party Residence or SOHO* subscriber site 1 *Small Office Home Office Called party Residence or SOHO* subscriber site 2 Telco Return In telco return configurations, the Cisco uBR7200 series universal broadband router provides downstream data flow from cable interface cards connected to the cable system and accepts upstream traffic via a combination of the local PSTN and IP network path that terminates at the Cisco uBR7200 series router. Upstream data transmission takes place over a telephone modem (external or internal to a cable interface, as well as a cable interface card in a PC, based on the third-party cable interface vendor) connected to an analog telephone line. Figure 1-8 on page 1-12 illustrates a telco return configuration. OL-5421-03 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide 1-11