This sounds like the extension has not been put into the ring group, as it is the pick-up key which is flashing on your prostar 816. you need to enter customer level programming and find out in MMC 714 which group is set up to ring and the go to MMC 601 and add the extention to the correct group under the members section. I know this sounds complicated but I have posted a video of which there are more to help you with the prostar 816 on YouTube search abbeytel, Or visit www.abbeytelcom.com.
This is a phone system phone and each station you want to ring when a certain phone line rings has to be programmed into the system. This is not something you can change at the phone itself. You will either need to pay a company to make programming changes or locate a programming and installation manual for your phone system (not the phone) and try to re-program it yourself. If you have not done this before it will not be easy but it may be worth the effort so you can continue to make your own changes instead of paying someone $200 per hour to do it for you.
There is also the remote possibility your phone's ringer is broken. You can try swapping your phone with another of the same type and model to see if it will ring.
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