Interviews, incidents, and design drills

Rooms

1. Signaling drill with the cited answer

   Each signaling answer is written here, with the RFC, before the quiz asks it.

2. Media drill with the cited answer

   488, 422, telephone-event, RTP, and the SRTP keying choice, each answered in the prose.

3. SBC drill with the cited answer

   B2BUA, where PSTN SIP lands, the trusted list, and Teams TLS, answered in the body.

4. Symptom, ladder, one packet, one variable

   The sequence is symptom, ladder, one packet, change one variable. The log in this lesson is synthetic.

5. An interconnect checklist, not a config dump

   Record TLS, codecs including telephone-event, E.164, trusted addresses, OPTIONS, and the SRTP keying choice.

6. CUCM, a certified SBC, and Teams Direct Routing

   CUBE or another certified SBC can sit between CUCM and Teams. No architecture SKU is invented here.

7. When the RFC number moves

   SDP, ICE, STUN, and TURN moved. The RFC Editor banner beats a blog, and an uncited successor stays an open question.

Ecosystem

SIP does not replace workforce management, quality monitoring, CRM, emergency policy, or a messaging registry. It is the session seam those systems hang from. Compliance notes on this page are educational and are not legal advice.

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