Initiate VoLTE calls even with mobile data / Wi-Fi OFF

4G LTE
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1

Hi Guys.
I shutdown mobile data and also wifi is off.
But I am able to initiate VoLTE calls.
Is it normal?

2

Yes, it is.

3

But there is no LTE mobile data.
It should return to 3G or 2G.
But it is not.

4

It’s on default bearer. On signalling.

5

But i can initiate call it means dedicated bearer is also working which is qci.

6

Data & IMS bearer are different, in case you want to perform CSFB, disable IMS/VoLTE switch.

7

Turn off data on phones mean that UE is not connected to internet pdn, but still connected to mme & ims pdn. So, volte call is still normal.

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