Configuring Rtp, Tcp, And Udp Header Compression - Avaya G250 Administration

The G250/G350 can decompress any type of compressed packet. Decompression is enabled
whenever compression is enabled. However, when enabling header compression on a Frame
Relay interface, you must first make sure that the remote host is also employing header
compression. Header compression on a Frame Relay interface does not check what the remote
host is employing. Thus, it may compress headers even when the remote host is not configured
to decompress headers.
You can configure how often the full header is transmitted, either as a function of time or of
transmitted compressed packets.
The G250/G350 offers two options for configuring header compression:
RTP, TCP, and UDP header compression, using the IPHC (IP Header compression)
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method, as defined by RFC 2507.
TCP header compression only, using the VJ (Van Jacobson) method, as defined in RFC
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1144.
Note:
VJ compression and IPHC compression cannot co-exist on an interface, and
Note:
IPHC compression always overrides VJ compression. Thus, if you define both VJ
compression and IPHC compression, only IPHC compression is enabled on the
interface regardless of the order of definition.

Configuring RTP, TCP, and UDP header compression

To configure IPCH-type RTP, TCP, and UDP header compression:
1. Optionally, configure header compression parameters. If you do not configure these
parameters, their default values are used.
Use the ip rtp compression-connections command to control the number of
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RTP header compression connections supported on the interface. Use the no form of
this command to restore the default value of 16. This command also sets the number of
connections in the non-TCP space, not just RTP.
Use the ip tcp compression-connections command to control the number of
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TCP header compression connections supported on the interface. Use the no form of
this command to restore the default value of 16.
Use the ip rtp max-period command to set the maximum number of compressed
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RTP headers that can be sent between full headers.
Use the ip rtp max-time command to set the maximum number of seconds between
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full RTP headers.
Configuring header compression
Issue 1.1 June 2005 119