3com MSR 20-20 참조 매뉴얼

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Use the ip tcp vjcompress command to enable a PPP interface to compress the 
VJ TCP header.

Use the undo ip tcp vjcompress command to disable the PPP interface to 
compress the VJ TCP header.

By default, the VJ TCP header compression is disabled on PPP interfaces.

If a PPP interface is enabled to perform VJ TCP header compression, so should the 
interface at the opposite end.

# Enable VJ TCP header compression on interface Serial 1/0.

<Sysname> system-view

[Sysname] interface serial 1/0

[Sysname-Serial1/0] ip tcp vjcompress 

ppp compression iphc [ nonstandard ]

Interface view

nonstandard: Nonstandard encapsulation mode.

Use the ppp compression iphc command to enable IP header (TCP header and 
RTP header mainly) compression on the interface.

Use the undo ppp compression iphc command to disable IP header 
compression.

By default, TCP header compression and RTP header compression are disabled.

Once IP header compression is enabled, the header compression for TCP packets 
used to establish RTP sessions is also enabled. When IP header compression is 
disabled, the header compression for TCP packets used to establish RTP sessions is 
also disabled.

To enable IP header compression, you need to execute the ppp compression iphc 
command on both ends of the link.

Note that:

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If the configuration is applied on VT and Dialer interfaces, ISDN and 
asynchronous dialer interfaces, the configuration takes effect only after you 
shutdown and then bring up the interfaces.