This daisy module is discontinued
Daisy-13 just provides data services (GPRS link, GSM link or SMS) and is not suitable for voice based applications.
This is the usable connectors where to plug this board using the factory default Linux image:
|TERRA||FOXG2O||Serial device||Available signals|
|D13||D1||/dev/ttyS2||TXD, RXD, RTS, CTS|
|D10||D6||/dev/ttyS4||TXD, RXD, RTS, CTS|
On the FOX Board G20 is requested a Daisy-1 adapter to wire-up this board.
More technical documentation from Teltonika: