The Grandstream HT802 Analog Telephone Adapter is typically used to add a fax machine to your ring-u® system. However it can also be used to add any analog telephone device such as a ruggedized portable phone. It also benefits from automagic™ configuration with the ring-u Hello Hub PBXes.
 
Be aware that using this adapter for an analog fax machine also requires the "Analong Fax Machine Connection"  service for 24.95 a month vs the included (free) electronic fax to email provided with all of our ring-u service plans. See our Service Pricing page for details. This adapter can not be used to interface with an alarm system of any type as this violates our terms of service.