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OPTIONS before the next INVITE
Diagram
Sources and go deeper
- RFC 3261 §11 — last checked 2026-10
- RFC 3261 §8 — last checked 2026-10
- RFC 5853 — last checked 2026-10
- RFC 3261 — last checked 2026-10
- RFC 3261 §21 — last checked 2026-10