Hello, in the company i work for, we have an UC560 with 10 SPA525G2 phones; two of them have CO Lines, but the transfer button appears disabled when there's an incoming call on the CO Lines of these phones.
At first i thought this was a firmware issue so i upgraded one of the phones to 7.5.1 to see if with this the problem dissapears but nothing happen... Can someone point me in the right direction to solve this situation?