company_contacts (company_id PK/FK, contact_id PK/FK)

parties (id PK)
contacts (party_id PK/FK, name, surname)
companies (party_id PK/FK, company_name, ...)
party_phones (party_id PK/FK, phone_id PK/FK)
party_emails (party_id PK/FK, email_id PK/FK)