VoLTE on the Xperia 10 II - filling in the gaps

General
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Oops, I accidentally posted in the wrong thread. moving my issue here:

So, I tried to enable VoLTE with Salt (Switzerland), but it just won’t work. The config looks fine:

[root@Xperia10II-DualSIM defaultuser]# getprop persist.vendor.somc.cust.modem0
S32.1

The modem config is in /vendor/firmware_mnt/image/modem_pr/mcfg/configs/mcfg_sw/generic/euro/salt/vw/ch/ and is correctly set:

[root@Xperia10II-DualSIM defaultuser]# cat /vendor/oem/modem-config/S32.1/modem.conf 
mcfg_sw/generic/euro/salt/vw/ch/mcfg_sw.mbn

However, enabling VoLTE in the ‘mobile network’ settings just results in the dot blinking indefinitely, staying at status ‘Not registered’.
journalctl logs the following messages when I enable the setting:

Jul 24 08:36:43 Xperia10II-DualSIM ofonod[2755]: imsradio0 < 7 requestRegistrationChange
Jul 24 08:36:43 Xperia10II-DualSIM ofonod[2755]:   0000: 76 65 6e 64 6f 72 2e 71  74 69 2e 68 61 72 64 77    vendor.q ti.hardw
Jul 24 08:36:43 Xperia10II-DualSIM ofonod[2755]:   0010: 61 72 65 2e 72 61 64 69  6f 2e 69 6d 73 40 31 2e    are.radi o.ims@1.
Jul 24 08:36:43 Xperia10II-DualSIM ofonod[2755]:   0020: 30 3a 3a 49 49 6d 73 52  61 64 69 6f 00 00 00 00    0::IImsR adio....
Jul 24 08:36:43 Xperia10II-DualSIM ofonod[2755]:   0030: 0a 00 00 00 00 00 00 00                             ........
Jul 24 08:36:43 Xperia10II-DualSIM ofonod[2755]: imsradio0 > 4 requestRegistrationChangeResponse
Jul 24 08:36:43 Xperia10II-DualSIM ofonod[2755]:   0000: 76 65 6e 64 6f 72 2e 71  74 69 2e 68 61 72 64 77    vendor.q ti.hardw
Jul 24 08:36:43 Xperia10II-DualSIM ofonod[2755]:   0010: 61 72 65 2e 72 61 64 69  6f 2e 69 6d 73 40 31 2e    are.radi o.ims@1.
Jul 24 08:36:43 Xperia10II-DualSIM ofonod[2755]:   0020: 30 3a 3a 49 49 6d 73 52  61 64 69 6f 52 65 73 70    0::IImsR adioResp
Jul 24 08:36:43 Xperia10II-DualSIM ofonod[2755]:   0030: 6f 6e 73 65 00 00 00 00  0a 00 00 00 00 00 00 00    onse.... ........

Those do not look pretty helpful to me. Is there any log where I can find more information about what’s going on?

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