Specifications

Configure Custom Queueing
Voice over IP for the Cisco AS5300 11
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:
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:
RTP Header Compression Configuration Example
The following example enables RTP header compression for a serial interface:
interface 0:23
ip rtp header-compression
encapsulation ppp
ip rtp compression-connections 25
For more information about RTP header compression, see the Cisco IOS Release 12.0 Network
Protocols Configuration Guide, Part 1.
Configure Custom Queueing
Some QoS features, such as IP RTP reserve and custom queueing, are based on the transport protocol
and the associated port number. Real-time voice traffic is carried on UDP ports in the range 16384
to 16624. This number is derived from the following formula:
16384 = 4(number of voice ports in the AS5300)
Custom queueing and other methods for identifying high priority streams should be configured for
these port ranges. For more information about custom queueing, refer to the the Cisco IOS Release
12.0 Quality of Service Solutions Configuration Guide.
Configure Weighted Fair Queueing
Weighted fair queueing ensures that queues do not starve for bandwidth and that traffic gets
predictable service. Low-volume traffic streams receive preferential service; high-volume traffic
streams share the remaining capacity, obtaining equal or proportional bandwidth.
Command Purpose
ip rtp header-compression [passive] Enables RTP header compression.
Command Purpose
ip rtp compression connections number Specifies the total number of RTP header
compression connections supported on an interface.