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VoWiFi/VoLTE not working on Fairphone 4 with /e/ (on Vodafone Germany and other networks)

  • /e/ version: 0.23
  • Device model(s): FP4
  • Device rooted: no

Summary

Phonecalls via LTE and WiFi not possible

The problem

FP4 cannot make calls via ims-service. VoWiFi/VoLTE not working

Activate VoWiFi in Network Settings and make a phonecall. Won't use WiFi For VoLTE: No Internetconnection while on phonecall.

a call connection over wifi should be established surfing while calling should be possible

Relevant logs (adb logcat)

Relevant screenshots Screenshot_20220516-223028_Telefondienste Screenshot_20220516-222945_Einstellungen Screenshot_20220516-223022_Telefondienste

Solutions

Workaround

none

Possible fixes

Checklist

Edited by Ray -