Hello,
excuse my english.
I have a problem with 2 Fanvil I20S doorphone.
This is the scenario.
My 3CX is in cloud in 3CX, the customer use APP on smartphone fine, he use GXP2140 phone fine, but the 2 Fanvil I20S don't register at the same time; if one is registred other is not registred, which...