5G Step-By-Step VoNR Call Flow

5G NR
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5G VoNR doesn’t fix a broken system.

It just upgrades a working one.

It’s 5G’s own voice calling solution.
Built for 5G from the ground up.

It offers cleaner audio.

And no fallback to 4G mid-call.

So what happens during a VoNR call?

Here’s the typical flow:

  1. Call starts
  2. Device sends RRC Connection Request
  3. Network responds with RRC Connection Setup
  4. NAS Registration Request follows
  5. Network sends Registration Accept
  6. PDU Session is requested
  7. Session is accepted
  8. SIP INVITE goes out
  9. Alerting begins
  10. Call gets answered
  11. Call gets confirmed
  12. The conversation continues
  13. And finally, the call ends

These steps are common in Standalone (SA) 5G.

Other setups? Slightly different flows.

It sounds complex—because it is.
But users don’t notice the steps.

They just feel the difference.

Thanks for reading.

PDF: :point_down:

5G Step-By-Step VoNR Call Flow (By Furqan Jameel).pdf (5.7 MB)

5G Step-By-Step VoNR Call Flow
5G Step-By-Step VoNR Call Flow524×461 63.2 KB

LinkedIn: :point_down:

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I am sorry to say this flow has missed lot of critical steps in VoNR MO call flow.