Release Notes for Cisco uBR924 Cable Access Router for Cisco IOS Release 12.0 XI 7
New Software Features In Release 12.0(4)XI
Home Office with Voice Support
Acceptable voice quality and reduction in network bandwidth usage are achieved by using several
voice processing techniques. Digital Signal Processors (DSPs), in combination with DSP firmware
in the Cisco uBR924 cable access router, provide the stream-to-packet and packet-to-stream
conversion, as well as voice processing capabilities. Typical voice processing services include echo
cancellation, voice compression, Voice Activity Detection (VAD) or silence compression and Dual
Tone Multi-Frequency (DTMF) tone detection and generation. Supported vocoders include:G.711
A Law 64000 bps, G.711 u Law 64000 bps, G.723.1 5300 bps, G.723.1 6300 bps, G.726 16000 bps,
G.726 24000 bps, G.726 32000 bps, G.728 16000 bps, G.729 Annex-A 8000 bps, G.729 8000 bps.
Use of the H.323 protocol typically involves a dial plan and mapper at the headend to map IP
addresses to telephone numbers. You can also set static routes. Use dial peer commands to define
local and remote peers. For the backup POTS port, define port and E.164 addresses. For remote
peers’, define remote peers IP address and E.164 address.
Note If you have Cisco Network Registrar (CNR) version 2.5 with TCL script, you can assign
E.164 addresses to local ports and use a gatekeeper to resolve the remote peers’ IP addresses. CNR
uses the DHCP option (merit dump file) containing an ASCII string which defines the E.164
address-to-port assignments. The Cisco uBR924 cable access router software creates dial-peers,
starts H.323 RAS gateway support, and registers the E.164 addresses with the gatekeeper.
Functionality is augmented in Cisco IOS Release 12.0(5)T and higher.
Network Address Translation and Port Address Translation (NAT/PAT)
Network Address Translation (NAT):
• allows customers to maintain their own private networks while giving them full Internet access
through the use of one or more global IP addresses.
• allows several private IP addresses to use the same global IP address by using address
overloading.
• facilitates configuration and permits a large network of users to reach the network by using one
Cisco uBR924 cable access router and the same DOCSIS cable interface IP address.
• eliminates the need to readdress all hosts with existing private network addresses (one-to-one
translation) or by enabling all internal hosts to share a single registered IP address (many-to-one
translation, also known as Port Address Translation [PAT]).
• enables packets to be routed correctly to and from the outside world by using the Cisco uBR924
cable access router.
• allows personal computers on the Ethernet interface to have IP addresses to be mapped to the
cable interface’s IP address.
Routing protocols will run on the Ethernet interface instead of the cable interface, and all packets
received are translated to the correct private network IP address and routed out the Ethernet
interface. This eliminates the need to run RIP on the cable interface.
To implement the Cisco uBR924 cable access router, the Ethernet interface is configured with an
“inside” address and the cable interface is configured with an “outside” address. The Cisco uBR924
cable access router also supports configuration of static connections, dynamic connections, and
address pools.
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