If you are developing GPRS based application on Ingenico terminal then use GCL library. It save your lots of time.You need to manage only around 50-100 lines of code. But it have less configuration option.
If you want all GSM feature then go with UNICAPT library.In this case you need to manage around 500 lines of code.
If you want all GSM feature then go with UNICAPT library.In this case you need to manage around 500 lines of code.