Avaya G430 Manual page 235

Note:
VJ compression and IPHC cannot co-exist on an interface, and IPHC always overrides VJ
compression. Thus, if you define both VJ compression and IPHC, only IPHC is enabled on
the interface regardless of the order of definition.
Header compression support by interface
Dialer
Note:
Non-IETF encapsulation is compatible with other vendors.
Configuring IPHC
About this task
IHPC applies to RTP, TCP, and UDP headers.
Note:
You cannot specify IPHC for a Frame Relay non-IETF interface.
Procedure
1. Optionally, configure the following header compression parameters.
Administering Avaya G430 Branch Gateway
Interface type
If you do not configure these parameters, their default values are used.
• ip rtp compression-connections
• ip tcp compression-connections
• ip rtp max-period
• ip rtp max-time
• ip rtp non-tcp-mode
IETF mode is not compatible with non-IETF mode.
• ip rtp port-range
For example:
Gxxx-001(config-if:Serial 4/1:1)# ip rtp compression-connections 48
Done!
Gxxx-001(config-if:Serial 4/1:1)# ip tcp compression-connections 48
Supported compression methods
IPHC and VJ
VoIP QoS
October 2013 235