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To share contacts you must log in as Jira administrator and open administration menu (1) to access "Projects" (2). On the left hand side find "Linking project contacts" (3). After clicking on it you'll be presented with a list of projects:
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Upon clicking "Manage" you are able to offer an access to contacts of particular project. In the above presented example, when we click on "Manage" (4) located within "Planning" project, its contacts can be shared with other listed projects:
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Sharing happens directly after ticking a project from a list. After making a choice click "Close" to approve it.
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Linked contacts are now visible in dedicated column (1). In a below example Jira's "Planning" project will have an access to contacts (and its members) from an "Assembly" (2) project (whilst "Assembly" project contacts won't see their counterparts from "Planning" project):
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As one can see, Planning's project administrator can see an exact view of "Contacts" from other listed below project (1):
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There's a possibility to add unlimited number of contacts to a particular project and link (share) an unlimited number of contacts between different projects. Any single Jira project can have also an access to unlimited number of contacts from other projects. Changes in an original contacts' content of certain Jira project are reflected directly and immediately among linked (shared) contacts in other Jira's projects contacts. This feature suits perfectly dynamic business environments who wish to sustain the highest level of stored information that is always up to date, or to be updated in real time. Highly recommended for import/export related businesses and stock exchanges, where heading to a right contact in right time means to win a high bid.