5G essentials

Start here: what 5G changes, the radio access network, and the core end to end.

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4G LTE Essentials

Why voice over LTE needs IMS

interactive3 min

Lesson 21 of 33

Card 1 of 617%

Warm-up: Guess before you learn

Try these first, even if you're not sure. Guessing primes your brain.

An all-IP network has no voice circuits. What is missing for calls?

Why not run voice as just another IP app?

CSFB drops a phone to 3G for calls. What does the user notice?

Answer all 3 to continue — it's OK to be wrong.

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