Hi,
I am on F1 visa and my I-20 is valid till Dec 2013. I am applying for H1B in april 2013 with a desi company and in case there is approval is it mandatory to go for stamping before Oct 01 or I can stay here?
If H-1 gets approved w/ COS, then you can start working on H-1 from Oct 1 and don’t need to get H-1 visa stamped immediately. Next time you travel outside of US, you will have to get it stamped to return and work on H-1.