If the teacher and the student live in the same time zone, you can take advantage of the 'free nights & weekends' that a few wireless phone companies offer. Nowadays cell-phones come with a head-phone and mouth-piece(aka 'headset') that you can use so that your hands are free while you use the phone. A friend of mine and I practiced over the phone a couple of times- he was singing and playing the harmonium on one end, while I played the tabla! It worked great!
The rudra veena that Manoj Kumar Sardar made is mine, so no I am not interested. I am working with every possible maker to bring up the standards of quality to what Murari Babu and Abdul Aziz had started.
Beenkar Ted Ceplina