Activate 1 VoIP SIP channel to manage the same number of simultaneous calls through Urmet-branded ATA FXO gateway devices for interfacing with traditional analogue lines (UTD 1375/864) and ISDN (UTD 1375/872). Licenses must be purchased from the store.urmet.com portal and associated with a specific iPerTalk system, via the UID identifier that uniquely identifies it.