Cisco Systems 3825 manual Unicast or Multicast RTP Packets

Appendix A Cisco 3825 Mobile Wireless Edge Router RAN-O Command Reference

ip rtp header-compression

	Unicast or Multicast RTP Packets
	This command can compress unicast or multicast RTP packets, and, hence, multicast backbone
	(MBONE) traffic can also be compressed over slow links. The compression scheme is beneficial only
	when you have small payload sizes, as in audio traffic.
Examples	The following example enables RTP header compression on the Serial1/0/0 interface and limits the
	number of RTP header compression connections to 10. In this example, the optional iphc-format
	keyword of the ip rtp header-compressioncommand is specified.
	Router> enable
	Router# configure terminal
	Router(config)# interface Serial1/0/0
	Router(config-if)# encapsulation ppp
	Router(config-if)#ip rtp header-compression iphc-format
	Router(config-if)#ip rtp compression-connections 10
	Router(config-if)# exit
	The following example enables RTP header compression on the Serial1/0/0 interface and limits the
	number of RTP header compression connections to 20. In this example, the optional iphc-format
	keyword of the ip rtp header-compressioncommand is specified.
	Router> enable
	Router# configure terminal
	Router(config)# interface Serial1/0/0
	Router(config-if)# encapsulation ppp
	Router(config-if)#ip rtp header-compression iphc-format
	Router(config-if)#ip rtp compression-connections 20
	Router(config-if)# exit
	In the following example, RTP header compression is enabled on the Serial1/0/0 interface and the
	optional periodic-refreshkeyword of the ip rtp header-compressioncommand is specified:
	Router> enable
	Router# configure terminal
	Router(config)# interface Serial1/0/0
	Router(config-if)# encapsulation ppp
	Router(config-if)#ip rtp header-compression iphc-format periodic-refresh
	Router(config-if)#ip rtp compression-connections 10
	Router(config-if)# exit
Related Commands	Command	Description
	clear ip rtp header-compression	Clears RTP header compression structures and statistics.
	iprtp compression-connections	Specifies the total number of RTP header compression
		connections that can exist on an interface.
	show ip rtp header-compression	Displays RTP header compression statistics.
	show running-config	Displays the contents of the currently running
		configuration file or the configuration for a specific
		interface, or map class information.

	Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide
OL-15667-03		A-43