Quality of Service guidelines
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
●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
Table 57 shows the results with and without RTP header compression. Note that these are rough measurements.
