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Healthy OPTIONS, then a call
Diagram
Sources and go deeper
- Direct Routing OPTIONS and TLS — last checked 2026-10
- Direct Routing SIP protocol — last checked 2026-10
- RFC 3261 §8 — last checked 2026-10
- RFC 3711 — last checked 2026-10
- Direct Routing definitions and RFCs — last checked 2026-10
- RFC 3261 §20 — last checked 2026-10