[asterisk-users] Checking status of a cell phone

[magnus.b at inputinterior.se]

I was a little unclear, it is not the cell phone that does the call-back, it 
is the cell-phone-network.
We can define 3 traffic-cases per cell-phone:
1) If cell-phone wont anser in x seconds call number a.
2) if cell-phone is busy call number b.
3) if cell-phone is unavailable call number c.