Adding Users: You can add/remove users anytime you want. No need for extra hardware or software license required. Adding Phone Lines: Adding extra phones might require extra hardware and /or software licenses. This depends on recording site configuration you selected. If recorder connected to PBX trunk lines, but you add only internal phones – no need for extra hardware or software on recorder side. If recorder connected to analog for sale or digital PBX extensions (internal lines) and you add extra lines to record, you will need both extra hardware and extra software license.