Adding ability to make calls through Microsoft Access / VBA

I have no experience doing VBA development. RingCentral provides industry-standard Restful API. So as long as your code can invoke Restful API, it is possible. Please post detailed questions when you have them.

If you enable the Click to Dial/Fax option in your RingCentral desktop application, you can use the following VBA code assigned to a Command Button to initiate the call programmatically.

Note: Change "Me.txtPhone" to the relevant field on your MS Access form.
Alternately, you can use the DLookUp function to refer to a table.

If IsNull(Me.txtPhone) Then
DoCmd.CancelEvent
Else
Application.FollowHyperlink ("callto:" & Me.txtPhone)
End If