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Configure IP Networks for Real-Time Voice Traffic
Figure 6-1
Before RTP header compression:
After RTP header compression:
You should configure RTP header compression if the following conditions
describe your network:
•
•
Do not use RTP header compression on links faster than two Mbps.
Note
Perform the following tasks to configure RTP header compression for VoIP. The
first task is required, but the second task is optional.
•
•
Catalyst 4224 Access Gateway Switch Software Configuration Guide
6-10
RTP Header Compression
20 bytes
8 bytes
12 bytes
IP
UDP
RTP
Header
2 to 4 bytes
IP/UDP/RTP header
Links slower than two Mbps
Need to save bandwidth
Enable RTP Header Compression on a Serial Interface, page 6-11
Change the Number of Header Compression Connections, page 6-11
Payload
20 to 160 bytes
Payload
20 to 160 bytes
Chapter 6
Configuring VoIP
OL-2031-02
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Troubleshooting
