Multi-Company Variant Working with the Multi-Company Variant119The company telephone book is treated exactly the same way on the system ter-minals as the other types of telephone books. This means that the entries listed inthe personal, central and company telephone books are displayed on the systemphones at the same time.Users can also use the telephone book of their company with the OpenCTI 50 andPhone Book Web applications, assuming they are authorised to use these applica-tions.In addition, it is also possible to assign a user group with the authorisation to editforeign company telephone books. This authorisation is useful if members of thisgroup - e.g. the “Administrators” - service the entire system. Foreign telephonebooks can only be edited in the Configurator in the Phone Book menu.The number of entries in a company telephone book is unrestricted. TheAastra 800 can manage up to 2,000 entries in all telephone books (in the central,personal and company telephone books).12.2.2 Making Calls Between CompaniesAll users of the Aastra 800 can make internal calls to one another, irrespective ofwhich company they belong to. Calls between users from the different companiesare therefore not subject to any restrictions.12.2.3 Billing Charges per CompanyIn the Costs Web application you can output the charges for each company.Users who are authorised to use this application can view the charges for eachcompany.