I have a KX-T61610 back at home. Recently I had the doorphone option (KX-T30865) installed.

I have installed only 1 doorphone. The distance between the doorphone and the 61610 is 180 ft approx, and the wiring is 26 awg.

I've programmed the 61610 so that every station is allowed to communicate with the doorphone.

Everything works fine, BUT one annoying detail: When the button is pressed on the doorphone, all stations ring as expected, I pickup the phone in any one of them, and I hear and talk with no problems.

But, when I hangup, right away the whole system rings again, as if someone had pressed the button again, but that's not the case.

I went so far as to get another doorphone unit, to no avail.

Does someone have a clue about this issue ? I'm an engineer with a lot experience with Pet Scan equipment, but I'm clueless here.

Thank you all guys in advance.