Sharp Z-800 (Audiovox 7900)

Hi,

Does anyone know if this type phone or another phone has the ability to carry on a Voice carryover conversation - looks like according to the manual and the menu of this phone - this phone has the ability to do TTY calls, I am not sure about VCO but it should have that ability.

Thanks for the information in advance,
Dman1202445 🙂