user manual

Cisco Hoot and Holler over IP
Configuration Examples
VC-847
Cisco IOS Voice, Video, and Fax Configuration Guide
session target ipv4:237.111.0.0:22222
ip precedence 5
codec g711ulaw
!
Note The configuration for the codec g711ulaw in the above configuration is not necessary—the default
codec of g729r8 could be used (and it would not display for show config).
Tips • The destination-pattern 111 for the VoIP dial peer matches the connection trunk string for the
corresponding voice port.
• The session protocol multicast command is essential for voice multicasting.
• The session target for voice multicasting dial peers is a multicast address in the range of from
224.0.1.0 to 239.255.255.255. This session target must be the same for all routers in a session. The
audio RTP port is an even number in the range of from 16384 to 32767 and must also be the same
for all routers in a session. An odd-numbered port (UDP port number + 1) is used for the RTCP
traffic for that session.
• The following codec restrictions apply:
– You must configure the same codec on all dial peers and routers in a session.
– Only G.711, G.726, and G.729 codecs are supported.
– When the default codec, G.729r8, is used, it does not appear in the configuration.
• Voice activity detection is enabled by default. Cisco recommends that this setting should not be
changed.
Ethernet Configuration
Configure the router’s Ethernet interface as follows:
!Configure physical interface for transmitting multicast packets.
!
interface ethernet 0/0
ip address 1.5.13.13 255.255.255.0
ip pim sparse-dense-mode!
Voice Multicasting over a WAN
The configuration for voice multicasting sessions over IP on Frame Relay is the same as for the Ethernet
LAN in the previous example. Configure the WAN interface on each router with the ip address and ip
pim commands and the sparse-dense-mode keywords as shown in the section “Voice Multicasting over
an Ethernet LAN.”