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Before I would suggest you to do masters in telecommunication engineering, I would suggest to write down the pros and cons in your work place. As far as I know telecommunication engineering has more flexible work options. Although there is lot of working hours per week, the working hours are quite flexible. You must weigh advantages and disadvantages. One of the major disadvantage is the security risk. But still it is manageable. I find very interesting job because they are sending you different countries for on-site projects. This will give you exposure to different cultures. This may help you to develop your personality as well.
In order to climb higher in your career, yes I would suggest you to do masters in Telecommunication Engineering. This my kick start your exposure widely and also may give you a better pay. The general rule in any profession is fine tune your skills. Get more degrees or get certification courses. Rather than switching careers where you need to start as beginner or from zero level, it is better to polish your present skills.
Dr. V. Shashikanth