Vintage phone won't ring when called?

I have a vintage Mickey Mouse phone (Manufacture date: 8/16/1990). When I hook it up it has a dial tone and will call any number you type in and I can hear the phone on the other end ringing. But when I call the Mickey phone I can hear the ringing tone on the phone I'm calling from but no ring from the Mickey... show more I have a vintage Mickey Mouse phone (Manufacture date: 8/16/1990). When I hook it up it has a dial tone and will call any number you type in and I can hear the phone on the other end ringing. But when I call the Mickey phone I can hear the ringing tone on the phone I'm calling from but no ring from the Mickey phone. I found another similar question regarding this type of phone but no substantial answers. Could the phones age make it slightly incomparable with the line? Thanks!
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