Client claims T26p is autoanswering

[ubunet]

I have the same problem with Yealink T22P(25 units).

These phones have auto-answer option and intercom option disabled.

Firmware V71 from ftp://yealinkftp:yealinkftp@ftp.yealink....wares/T2x/ in all phones!!

Asterisk 1.8.22

My client is very angry because it is a multinational with many calls and entering abruptly calls is irritating and unproductive.

I deleted a queue that was set up to see if it solved the problem. Now I have only one ring group and still doing the same ( Dial(SIP/200&SIP/201&...SIP/N) )
In any of the phone the call is answered on handsfree! Without touching anything, with the phone idle.

We need a solution to this problem, because our companies are compromised by a "bug" it seems our responsibility and misconfiguration.

Yealink please, give us a solution.

Thanks in advance.