Thanks Wagner,
Basically my project consists in 3 parts: The PBX server (3CX Phone System: administrative purpose), terminals (3CX Phone Android: smartphones with WiFi connectivity) and Main application (Custom GUI: smartphones or tablets).
The Custom GUI is basically an application with buttons, no more, to select specific terminals under a paging group. I was thinking to design the GUI with Adobe Flash and talk to the PBX using something like PHP. We can see the Custom GUI like a soft client installed in a smartphone or tablet. Its job is to select/talk the paging groups.
Thanks in advance for your answer
Rodeo