Forum OpenACS Development: Re: OpenACS: the core and the packages/plugins
another option for you might be the Attribute Management System (or Dynfields as it is called in Project Open) https://openacs.org/xowiki/ams which you could use to add whatever attributes you need (phone numbers, emails etc) to the PARTY object. I haven't personally used it, but from what I know it should be a good fit. Hopefully someone can correct me if there is a better tool.
the Contacts package relies on AMS.