T22P No Ringing

INFO:
-T22P
-Firmware 7.73.193.50.zip

PROBLEM:
-when call to other extension, no tone when press any key
-when receive call from other extension, no ringing but light blinking
-I can hear other party voice and vice versa
-I can see there is voice mail indicator blinking, but I try to access it ask me an account. I can't hear anything.
-Speaker phone, no sound as well

Seems this problem is common for Yealink.
How to fix that

thanks