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OPTIONS, then 503
Diagram
Sources and go deeper
- RFC 3261 §11 — last checked 2026-10
- RFC 3261 §21 — last checked 2026-10
- RFC 7866 — last checked 2026-10
- Cisco CME toll-fraud prevention — last checked 2026-10
- Direct Routing OPTIONS and TLS — last checked 2026-10
- Cisco SRST trusted IP authentication — last checked 2026-10
- RFC 3261 — last checked 2026-10