Client claims T26p is autoanswering

[jlopes.ipbrick.com]

I have the same problem in two Yealink T28P.

Firmware Version 2.70.0.140
Hardware Version 1.0.0.39

I have captured this issue of the phone with username 100, which receives a call from +351339363735.
The phone 100 is registered to an Asterisk based system.
These phones have headset.
These phones have auto-answer option and intercom option disabled.

Syslog from a syslog server that capture the syslog 6 from Yealink phone:
http://downloads3.ipbrick.com/tmp/yealin...01.log.zip

Phone configuration:
http://downloads3.ipbrick.com/tmp/yealin...config.bin

Pcap file captured from Server where phone is registered:
http://downloads3.ipbrick.com/tmp/yealin...sue01.pcap

Can anyone help.

Thanks in advance.