However, I believe you have to be comfortable and convincingly experienced in that particular area in order to get such a contract. Which is not always an option since the area is ‘very specialized’.
Or you may be able to deal with wide range of IT problems that includes that area, but then there's a question of credibility—whether that particular area would seem like something you can deal with to company management, considering that you've never done exactly that thing before. In this case it seems that you either need strong reputation for dealing with different problems successfully, or some leads inside the company. (Either way is possible, of course, but apparently not as easy as it may seem on the first sight.)
Or you may be able to deal with wide range of IT problems that includes that area, but then there's a question of credibility—whether that particular area would seem like something you can deal with to company management, considering that you've never done exactly that thing before. In this case it seems that you either need strong reputation for dealing with different problems successfully, or some leads inside the company. (Either way is possible, of course, but apparently not as easy as it may seem on the first sight.)