I downloaded Groundwire, on Android and then registered for an account on FlyNumber. I'm having trouble finding where to link my SIP details at, at either place. I put in a random phone number, but not sure what to do about getting one. A little guidance would be greatly appreciated.
You would get the SIP credentials from My account > PBX and in PBX use the person module to add a new device
PM your username and we can set this up from here