Cisco 3600 Series Konfigurationshandbuch - Seite 9

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You should configure RTP header compression if the following conditions exist in your network:

•

Note

Perform the following tasks to configure RTP header compression for Voice over IP. The first task is

required; the second task is optional.

•

Enable RTP Header Compression on a Serial Interface

To use RTP header compression, you need to enable compression on both ends of a serial

connection. To enable RTP header compression, use the following command in interface

configuration mode:

Command

ip rtp header-compression [passive]

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.

Change the Number of Header Compression Connections

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 command

in interface configuration mode:

Command

ip rtp compression connections number

RTP Header Compression Configuration Example

The following example enables RTP header compression for a serial interface:

For more information about RTP header compression, see the "Configuring IP Multicast Routing"

chapter of the Network Protocols Configuration Guide, Part 1.

Slow links

Need to save bandwidth

RTP header compression should not be used on links greater than 2 Mbps.

Enable RTP Header Compression on a Serial Interface

Change the Number of Header Compression Connections

interface 0

ip rtp header-compression

encapsulation ppp

ip rtp compression-connections 25

Configure RTP Header Compression

Purpose

Enable RTP header compression.

Purpose

Specify the total number of RTP header

compression connections supported on an interface.

Configuring Voice over IP for the Cisco 3600 Series VC-21