The AD1 is a module of F1 allowing remote monitoring operators to proceed to the VoIP audio verification exactly the same way than with RTC/RNIS networks, by using their telephone set. It ensures the routing of audio streams from the alarm transmitter to the operator and vice versa in VoIP through the XoIP. It makes it possible to ensure up to 30 simultaneous VoIP flows and thus 30 verifications or half/full duplex voice handling.
AD1 also transfers the flow from one CODEC to another in the event that the transmitter does not use the G711A. The currently available CODECs are G711A and SPEEX. It therefore enables rapid adaptation of a conventional ISDN- type infrastructure to the world of VoIP.