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Chapter 6
Configuring VoIP
Enable RTP Header Compression on a Serial Interface
Change the Number of Header Compression Connections
RTP Header Compression Configuration Example
Configure Custom Queuing
OL-2031-02
You need to enable compression on both ends of a serial connection. To enable
RTP header compression, use the following interface configuration command:
c4224(config-if)# ip rtp header-compression
If you include the passive keyword, the software compresses outgoing RTP
packets only if incoming RTP packets on the same interface are compressed. If
you use the command without the passive keyword, the software compresses all
RTP traffic.
By default, the software supports a total of 16 RTP header compression
connections on an interface. To specify a different number of RTP header
compression connections, use the following interface configuration command:
c4224(config-if)# ip rtp compression connections
The following example enables RTP header compression for a serial interface:
c4224(config)# interface serial0
c4224(config-if)# ip rtp header-compression
c4224(config-if)# encapsulation ppp
c4224(config-if)# ip rtp compression-connections 25
For more information about RTP header compression, see the "Configuring IP
Multicast Routing" section of the Network Protocols Configuration Guide, Part 1
for Cisco IOS Release 12.0 T.
Some QoS features, such as IP RTP reserve and custom queuing, are based on the
transport protocol and the associated port number. Real-time voice traffic is
carried on UDP ports ranging from 16384 to 16624. This range is derived from
the following formula:
16384 + (4 x number of voice ports in the c4224)
Catalyst 4224 Access Gateway Switch Software Configuration Guide
Configure IP Networks for Real-Time Voice Traffic
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passive
number
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Troubleshooting
