C2 VoLTE provider support

Sailfish OS version: 5.0.0.29
SIM provider and country: S-Budget, AT (T-Mobile/Magenta/tele.ring)
Network provider and country (if roaming): -
Number of SIM cards in use and in which slot: 1 / 1

Country Provider Registered Voice in Voice out SMS in SMS out MMS in MMS out Compared
AT S-Budget* x ?

Notes:

  • Voice In drops to 2.5G while call is incoming but does not ring, call is being dropped to mailbox/voicemail

  • App “Netmon VoLTE” sais “SMS capable: NO”

  • after Voice In drops to 2.5G, goes back to 4G, but LTE registration fails. Going in and out of flight mode makes registration work again

  • Network operator name is displayed on Lock Screen, but not in SIM Settings or Mobile Network SIM selector. Shows up as ‘Unknown’.

  • signal strength is always ‘100’ in Netmon VoLTE and collectd/systemdatascope.