You can use the latest PK2 Version for VoLTE, by made small modifications:
use from the PI-Version: imsservice.apk, imsframework-internal.jar, imsframework.jar, imssettings.apk,
imstelephony.apk and 1 or 2 other (missing) IMS-.apk files and compare the /lib dir between the
2 roms. in the...