Special firmware for Yaelink T46G and T46S ( EXP40 + EHS36 compatibility)
Reference:
https://www.3cx.com/community/threads/yealink-txx-with-upgrade-to-xx-82-0-30-with-exp40-ehs36.53014/
https://www.reddit.com/r/3CX/comments/7jbwiz/yaelink_t46g_exp40_ehs36/