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The ladder stays SIP
Diagram
Sources and go deeper
- RFC 7866 — last checked 2026-10
- RFC 7865 — last checked 2026-10
- RFC 6881 — last checked 2026-10
- RFC 6442 — last checked 2026-10
- FCC MLTS 911 requirements — confirm
- RFC 3261 — last checked 2026-10
- RFC 3550 — last checked 2026-10
- Cisco Unity Connection — last checked 2026-10
- Cisco Unified Communications Manager — last checked 2026-10
- Cisco CUBE basic SIP configuration — last checked 2026-10