Fax tone sound when answering call

[300mag]

Never had this issue before on Obi200 using it with google voice.  When I answer a phone call Im a series of tones similar you hear from fax machine.  It is only hooked up to telephone, no line going to fax or printer.  Any idea, can this be a setting. Im no expert with obitalk so any help would be appreciated.  I tried searching but couldn't find any similar threads.

[n6ac]

On received calls, we have this occasionally also, despite having no fax plugged in on either side of the call.
It is really extremely loud and off-putting to callers.
We would appreciate hearing of any solution.