Hi,
Please try disabling 'hanguponpolarityswitch=yes' in /etc/asterisk/chan_dahdi.conf! If the problem still there, please make a recording and send it to me! My Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Sometimes man-made statics or surrounding electrostatics may lead to this result.
Please comfirm there is no electrostatics problem around the A400P card.
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Skype: tim.jjune
