Digital Voice & Codecs

Deep dive into audio codecs, compression algorithms, and voice quality metrics.

Lessons in this section

• Number Lookup and Caller Identity (CNAM)
• Analog to Digital — The Nyquist Theorem and PCM
• Voice Quality Metrics — MOS, PESQ, POLQA, and R-Factor
• Compressed Codecs — G.729, G.722, and Why Compression Matters
• G.711 — The Universal Codec
• Opus — The Modern Codec and Why It Won
• Verify API — Two-Factor Authentication

🔒 Full Course Content Available

This is a preview of the Telephony Mastery Course. The complete lesson includes:

• ✅ Detailed technical explanations
• ✅ Advanced configuration examples
• ✅ Hands-on lab exercises
• ✅ Real-world troubleshooting scenarios
• ✅ Practice quizzes and assessments

🚀 Unlock Full Course Access

Preview shows approximately 25% of the full lesson content.