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UDP in, TCP out
Diagram
Sources and go deeper
- RFC 3261 §18 — last checked 2026-10
- RFC 3581 — last checked 2026-10
- RFC 7118 — last checked 2026-10
- Cisco CUBE basic SIP configuration — last checked 2026-10
- Cisco CME toll-fraud prevention — last checked 2026-10
- RFC 3261 §17 — last checked 2026-10