hi guys. a noob question which i really cant figure out.

i swap my old cordless phone C601A to this new C1001LA model from my friend which is also using unifi. after swapped, it can call out, but when receive call, it will not ring and will not show who is calling, but when i answer it then i am actually able to pick up that call.

anyone knows how to fix it? does it need to do any calibration or settings?

Thanks in advance...

after swap it actually work but thing is it doesn't ring when receive call