Thank you a lot. I am still at the on ramp of the learning curve.
I set the resolution to low in the dipswitch settings from the Mame UI (tab).
Indeed this is just a 2.6Ghz PC.
Service menu worked!
Volume was an entry on the main menu.
the Calling was found in-
ITNET Menu>ITNET Adjustables Menu>Disable/Enable Calling
Used trackball to navigate menu and Start button for selections.