Voice Signaling edit
- QSIG – ISDN-based signalling protocol
- Q.931 – ISDN signalling protocol. Most common D-channel protocol.
- DSS1
- Media Gateway Controller
- Session Initiation Protocol
- H.323
- Signaling gateway
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VoIP – Other edit
Telecom hierarchy edit
Technologies edit
- IEEE 802.1Q – VLAN tagging
- H.450.3 – Technology to reduce call legs on forwarded calls