Troubleshooter is almost there but I would want to put it this way.
Release: You have completed 2 years working in Qatar and got an opportunity to work for another good one, you need release (Present sponsor is releasing you to join another company/sponsor) from your current company to join the new company.
NOC: (a) You have completed your 1 year in Qatar and wanted to join the company in between. The present sponsor may give you NOC (Present sponsor has no objection if you work for another company/sponsor) to work for another Company without exiting the country. This NOC will be valid for 6 months and can be renewed for twice.
(b) You are exiting Qatar and want to come back to join another company within two years. Your sponsor may provide you NOC to come back and join the other company/sponsor.

“Hell, there are no rules here - we're trying to accomplish something.” - Thomas A. Edison