Glossary
- DDI
- Direct Dialing Inward
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- DID
- Direct Inward Dialing
- DTMF
- Dual Tone Multi-Frequency
- PSTN
- Public Switched Telephone Network
- RTP
- Real-time Transport Protocol
- SIP
- Session Initiation Protocol
- TCP
- Transmission Control Protocol
- UDP
- User Datagram Protocol
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