Incident Forward names type

Summary:

When forwarding an incident and using the 'Select Names' window, where is it picking up addresses with type 'Address' from.

Content (required):

When forwarding an incident and using the 'Select Names' window, where is it picking up addresses with type 'Address' from.

I understand where 'Account', 'Distribution List' and 'Group' is sourced from, but cannot work out where lists with type 'Address' is stored.

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Code Snippet (add any code snippets that support your topic, if applicable):