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330 Avaya Application Solutions IP Telephony Deployment Guide
RTP header compression test
This section details the results of a simple RTP header compression test that was conducted in
a laboratory environment. Although this test was conducted using Cisco routers, the expected
behavior is the same for any router that performs this function as specified in RFC 2508. This
test was performed in the laboratory configuration that is shown in Figure 91
.
Figure 91: Equipment configuration for RTP header compression test
In Figure 91:
● NetIQ Chariot v4.0 was used to simulate IP Telephony calls between the two endpoints.
Chariot v4.0 accurately simulates the characteristics of various codecs, and uses a
40-byte IP/UDP/RTP header.
● Sniffer Pro v3.50.02 was used to capture the sent and received packets.
● The Cisco 3600 had IOS v12.1(2)T, and the Cisco 1600 had IOS v12.0(12).
● The Frederick Engineering Parascope WAN probe was tapped into the V.35 serial link to
take bandwidth measurements.
● This test was performed using PPP encapsulation on the WAN link.
A single call was placed between the Chariot endpoints using various codecs, all sending 20-ms
voice packets.
Table 57
shows the results with and without RTP header compression. Note that these are
rough measurements.