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Chapter 4 Operational Concepts and Configuration Examples
54 Avaya X330WAN User’s Guide
Note: When the device on the other end is an Avaya device:
- Configure the port range of both X330WANs to the same range using the
ip rtp
port-range
command. Verify that your voice application (the Avaya DEFINITY
Communication Server) is configured to the same port range.
- Configure both X330WANs to the
ietf mode using the ip rtp non-tcp mode
command.
Note: In order to verify that the number of concurrent compressed TCP connections
is the same in X330WAN and in the router connected on the other side of the WAN,
use the
ip tcp decompression-connections command. This command ensures
decompression of TCP packets compressed by both routers.
Configuration tip: To obtain better voice quality when using cRTP, set the VoIP
queue size to twice its original size. To perform this, do the following:
1 Set the VoIP mode using the
voip-queue command within the specific Serial
interface context.
2 Exit the Serial interface context.
3 Obtain the current VoIP queue size using the
show queuing command. The
VoIP queue is the “Queue 1 (High)”.
4 Set the VoIP queue to twice the current size using the
queue-limit <queue
id> <size>
command within the previous Serial interface context, where
queue id = 1 and size is twice the original value.
To configure RTP header compression, use the following commands:
• ip rtp header-
compression
Enables compressing outgoing RTP packets.
• ip rtp compression-
connections
Changes the number of connections the interface
accepts for RTP compression.
• ip rtp max-period
Sets the maximum number of compressed packets
sent between two full header packets.
• ip rtp max-time
Sets the maximum number of seconds between
transmission of two full header packets.
• ip rtp port-range
Sets the RTP port numbers range.
• ip rtp non-tcp-mode
Sets the non-tcp decompression mode.
• show ip rtp header-
compression
Displays the active RTP compression parameters.