Crash on call initiation

[skr4n]

Greetings! I have built the apk and installed it on a Galaxy M21 (Exynos 9611) from source as per README and #16. It is running LineageOS 21 GSI Feb build. The carrier is Airtel India. Network type has been set to "LTE only" via *#*#4636#*#* in an attempt to force the usage of VoLTE as otherwise, the phone simply resorts to making 2G calls. WiFi is enabled.

Issue:

After setting up the Ims apk as instructed, initiating a call does ring the receiver's end, but upon accepting the call, the caller's end drops the call with a popup "Ims has stopped working", indicating a crash. The call stays on the other end with silence. Receiving a call does the same, clicking "Answer" results in an immediate call drop with the popup "Ims has stopped working", the call stays on the other end with silence.

I have collected the log using adb logcat -b radio. Log: log.txt Crash Log: crash.txt

Thank you for your work.