GSM / GPRS boad based on A6n module

Hello Word !

I use A6 GSM with Arduino Nano.
The Board i this one :

I can Send and Receive SMS via AT Commands, then communication between A6 module and Arduino is OK.

I found a lot off library for SIM800, SIM900 modules (and shields), but not working library for A6 one...

Is someone use this module, wich library are you using ?

Many thanks, and sorry for my poor english