Features351System functions and features as of R3.0syd-0367/1.3 – R3.0 – 03.20139. 1. 3 TerminologyThe following terms are used:Tab. 140 Terms are usedTerm UsageInternal user An internal user has an internal user number. An internal user is assigned one or moreterminals.External user An external user is located in the public network (outside the private network).PISN users A PISN user is connected to another node (PINX) of the private network (PISN: PrivateIntegrated Services Network). A PISN user can also be a user in a virtual PINX (virtualPISN user).User A 1. User in a feature scenario (the person who sets up a call for example)User B 2. User in a feature scenario (the person who answers user A’s call for example).User C 3. User in a feature scenario (enquiry call between user B and user C for example)Service Function offered by the network provider and carried out in the public network, in par-ticular an ISDN supplementary service.Feature Function provided by the system and carried out locally in the communication server.
