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Real-Time Transport Protocol (RTP) Analysis in Wireshark: X-Lite Recordings & Codecs

Learn to capture and analyze RTP streams, inspect RTP and RTCP packets, understand seq and timestamp values, and configure codecs in X-Lite. Discover how to manipulate RTCP reports, adjust reporting frequency, and explore telephony flows. The guide also delves into managing recorded voice files and directory settings in X-Lite.

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Real-Time Transport Protocol (RTP) Analysis in Wireshark: X-Lite Recordings & Codecs

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  1. [Lab] Real-Time Transport Protocol (RTP)

  2. Record audio in X-Lite. • Find out the directory which stores recorded voice, and how to change that.

  3. Ask student to team up. • Capture RTP streams according to SDP. • Verify the src/dst ports are consistent with the ones indicated in fields c and m.

  4. Inspect RTP packets. • Calculate its size. • Explain the value of seq and timestamp. • Do they always start from 0? • See RFC 3550 P.15

  5. configure X-Lite to use different codecs • Check how the field of Payload Type in RTP changes accordingly.

  6. Inspect RTCP packets. • How often does your SIP UA generate RTCP reports? • Do X-Lite and Linphone generate RTCP reports in different frequency? • Can you adjust that?

  7. Wireshark • Telephony • Flow • Player

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