I assume that you have similar routers in both locations? If you experience one-way audio down there, scan the forums for the cures.
Also, are you letting the device get its own IP address or did you assign an IP address yourself? There is a chance there may need to be a change when you get down there.
Me? I'd buy two units and leave one there. Then call there and if somebody answers you KNOW they broke in and you call the police. People hate to not pick up a ringing phone :-)