Hello, The idea is to use a LinkSys SPA3102 VoIP Gateway to transfer our PSTN line to SIP and connect it to the 3CX server. This should normally work fine for handling incoming and outgoing calls using our IP phones (LinkSys). Correct? Now, when we are not available we want to forward the call to our mobile phone. Because this call is to a mobile phone and we want to avoid to subscribe for a second PSTN line, we hoped to do this with a cellphone modem. Is this supported by 3CX? What devices are compatible to plugin the SIM card of the mobile phone company and connect it with the 3CX system? Thanks for your help!