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Baseline OPTIONS, then one INVITE
Diagram
Sources and go deeper
- Cisco CME toll-fraud prevention — last checked 2026-10
- RFC 3264 — last checked 2026-10
- RFC 3261 §11 — last checked 2026-10
- Cisco CUBE basic SIP configuration — last checked 2026-10
- RFC 3261 — last checked 2026-10
- Direct Routing OPTIONS and TLS — last checked 2026-10