[4.6.0.15] [Xperia 10 V] [Volte] - unable to connect to the internet via cellular network

REPRODUCIBILITY: 100%
OS VERSION: 4.6.0.15
HARDWARE: Xperia 10 V
UI LANGUAGE: EN (US)
REGRESSION: NEW

DESCRIPTION:

Internet connection via cellular network doesn’t work with 4G calling (beta) - volte enabled.
When you turn this option on, connection has been lost after few minutes and it’s not possible to get it back.
If you turn this option OFF, connection arrive.

PRECONDITIONS:

Flashed Sony Xperia 10 V with SW_binaries_for_Xperia_Android_14_5.4_v3a_zambezi and via flashing tool from: [Release notes] Sauna 4.6.0.15

STEPS TO REPRODUCE:

  1. Go to “Settings” → “Cellular network”.
  2. Turn ON - “4G calling (beta)” option.
  3. Try to go to some URL in browser.

EXPECTED RESULT:

Stable connection till I turned off it manually.

ACTUAL RESULT:

Connection has been lost after few seconds / minutes.

MODIFICATIONS:

ADDITIONAL INFORMATION:

Turned off VOLTE - connection is working without problem anytime.