What to do when professor is not responding to emails or calls and his action is required to commence a masters thesis?
You didn't really ask a clear question but I will answer the implied question: "How would you handle this situation?"

My experience with emails and professors is they are hit and miss. For some this is a very reliable method of communication, for others it is not. This isn't necessarily generational since quite often universities give young professors a new email address which becomes just one more thing they must monitor. In addition, as the semester progresses, most professors' inboxes become flooded with student email along with the usual administrative junk mail.   

My suggestion would be find some way, phone call, in person visit or "ambush" outside of a regularly scheduled class. Once you find a way to make contact, explain your predicament with your boss and ask if there is a better method of communication. If the reply is "just use email" then explain this has proven unreliable and if you are to continue with the collaboration you need another method.  

Bottom line is this is a collaboration.  If you are unable to collaborate, you will not finish your research and you will damage your reputation at your job.  If the professor is unable to communicate in a manner supporting the collaboration, you need to find a different professor of find a different thesis.