I have this project which has been given me sleepless nights.

I dial from a POS terminal through modems on coms 1, 2,3 to a remote application router. The modem dials with the message data sent from the POS interface. This data is routed to the RRAS through the modem. However, To accommodate virtual com port, I bought a digiport(16 port) to accomodate transactions from very many sites simultaneously. To my suprise, The modem dails, The POS displays data sent but not log of data sent reached the RRAS

Could it be, Even though am not sure, that I need an AT/hayes commands/combination on the com port configured on the RRAS profile to accept data just as can be done specifying AT S0=1 for a ring?

If such exist. I want to know about it
Modem experts should assist as well as prof.