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Two legs, two Call-IDs possible
Diagram
Sources and go deeper
- RFC 7092 — last checked 2026-10
- RFC 5853 — last checked 2026-10
- RFC 3261 §16 — last checked 2026-10
- Cisco CUBE basic SIP configuration — last checked 2026-10
- Cisco Unified Communications Manager — last checked 2026-10
- Cisco Unified Contact Center Express — last checked 2026-10
- Cisco Unified Customer Voice Portal — last checked 2026-10
- Cisco CME toll-fraud prevention — last checked 2026-10
- Cisco SRST trusted IP authentication — last checked 2026-10
- Direct Routing OPTIONS and TLS — last checked 2026-10
- Direct Routing SIP protocol — last checked 2026-10
- Plan Direct Routing — last checked 2026-10