Voice calls switching naming

RAN
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1

Hi,

Voice calls switching from VoLTE to 2G/3G is called SRVCC.

What about other switching?

  1. VoNR to VoLTE is called…?
  2. VoNR to LTE is Called…?
  3. VoNR to GSM is called…?
2

No special handling needed between VoLTE and VoNR as both are PS calls.

Switching of call directly from NR to 2G/3G is not allowed.

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3

Inter-Rat HO or PSHO (no specific name for Voice I know)

Drop :frowning:

No direct HO, first PSHO to 4G than SRVCC to 3G.

This is my knowledge… :slight_smile:

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4

The first one us unique, since you need a special handling to let VoLTE (IP based calls) to continue on the legacy network.

The others didn’t require a special solution as far as I know.

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