NEW: Advantech GPIO cards supported.
Outputs 1-4 – SIP Provider 1-4 ringing
Outputs 5-8 – Device 1-4 occupied (no handset)
Inputs 1-4 – Answer next to Device 1-4
Inputs 5-8 – Drop on device 1-4
FIX: Problems making calls when SIP gateway requires a password for authentication.