Twido + dialup

I've worked with Modicon Momentum,Micro61204 and they have a feature for dialup «xmit loadable», now i want to create a application for remote data aquisition with TSX Twido (Preferably) or in alternative with TSX Micro, anybody could i've any ideias how to put a micro or twido dialling and sent information «Modbus» over PSTN/GSM ?

The Twido has the ability to output ASCII strings (EXCH function), but I think it would be difficult to initiate a phone call and then revert back to Modbus. So far my Twidos have only had to "answer".

The TSX Micro does have a selection of communication functions which provide similar functionality to XMIT.