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Media drill with the cited answer
488, 422, telephone-event, RTP, and the SRTP keying choice, each answered in the prose.
Learn in 5 minutes
- Answer 488 from RFC 3261 and RFC 3264
- Keep 422 on RFC 4028
- Name RTP and the two keying choices
Visual
Say the cite with the sentence.
Worked example
Name this 488 The final response is 488. What do you say in the interview?
- Press Play.
- Step until the hop named in the question.
- Inspect that message and answer the check.
Fault
The ladder shows 200 OK with c=IN IP4 203.0.113.20 and m=audio 19642 RTP/AVP 0, and the ticket says 488. No RTP is captured.
488 would have been the final response instead of 200. RFC 3550 is the media.
Quiz
Ecosystem
Glossary, sister systems, and the integration seam for this room.
Quality management and recording QM scores interactions. The standardized way an SBC forks a session to a recorder is SIPREC.
Sources and go deeper
- RFC 3261 §21 — last checked 2026-10
- RFC 3264 — last checked 2026-10
- RFC 6337 — last checked 2026-10
- RFC 4028 — last checked 2026-10
- RFC 4733 — last checked 2026-10
- RFC 3550 — last checked 2026-10
- RFC 3551 — last checked 2026-10
- RFC 3711 — last checked 2026-10
- RFC 4568 — last checked 2026-10
- RFC 5764 — last checked 2026-10