T22P No Ringing

[nbctcp]

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

[Yealink_Michael]

hi

please check if you set the volume to the mute

then try to factory reset the phone and test again

[nbctcp]

Volume max
Factory reset already try 2 times
No DND.

I'll return this item to the seller this morning.
I'll try http://www.escene.cn because it has
-LDAP Phonebook
-https GUI
Does Yealink have those?