I'm currently trying to use the built in entity '@sys.zip-code' from DialogFlow (formerly API.AI) for capturing Zip Codes. However so far it does not seem to recognize any actual zipcodes except those which I explicitly set through training. It also does not recognize the '5 digit' pattern as a possible match if @sys.phone-numbers is used in another intent (ex: 54545 gets recognized as a phone number, rather than a zip).
Should I upload a list of known zipcodes through the training section to get this working? Or is there something I'm missing from the built in functionality? Haven't seen a ton of info online on how to best utilize this entity, so figured I'd ask here before coming up with a custom solution.
Thanks in advance!