Hello Robert again
Assigning Account Codes to a call is necessary to allow accurate billing. It is easy to do via the Phone Manager (F3 - Number / Name /Account Code), but I can find no documentation on how to do this via TAPI (lineMakeCall). I suppose that this is because Account Codes aren't standard telephone things, but I can't be the first person to hit this problem.
Sorry to bleat on but ....