Noise

Good afternoon.
Available:
OpenVox FXOS-200 2 pcs
Openvoks FXO-100 2 pcs
OpenVox A1200P, PCI 1 pc
Drivers got normal. But when the phone is connected to port FXS, you hear a continuous noise periodically falls silent for a split second, and only those fractions of a second dial tone (raised Asterisk). Audio recording: http://yadi.sk/d/H95ifwZ0RZrGv
Please help!

Hi,
for more detail, please contact me by skype.I'll try my best to help u.
Skype:linda.li258