General Telephony Course
Gain expertise in PSTN, VoIP, SIP, dial plans, QoS, and E911 through this comprehensive course. Design robust voice networks, manage migrations, secure SIP trunks, and implement dependable telephony solutions for contemporary telecom needs in a structured learning path.

4 to 360h flexible workload
certificate valid in your country
What will I learn?
This course offers a practical overview of voice systems including PSTN, TDM PBXs, VoIP, SIP, and RTP. Participants learn to design dial plans, call flows, numbering schemes, plan migrations, manage analog devices, and integrate IP or cloud PBXs. It covers QoS, security, redundancy, E911, and testing for reliable calling setups.
Elevify advantages
Develop skills
- Design VoIP systems: select codecs, map call flows, and deploy IP or cloud PBXs.
- Create dial plans: set up DIDs, IVRs, hunt groups, and extensions.
- Optimize QoS and failover: prioritize voice packets, ensure redundancy, and route E911.
- Deploy SIP trunks and SBCs: secure connections, normalize signals, and verify PSTN links.
- Execute PSTN to VoIP transitions: configure hybrids, port numbers, and support legacy devices.
Suggested summary
Before starting, you can change the chapters and the workload. Choose which chapter to start with. Add or remove chapters. Increase or decrease the course workload.What our students say
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