The Telecom FM Cellroute GSM Gateway enables the user to connect a single analogue telephone or connect to a single analogue trunk port of a phone system to enable calls over the GSM network. There are three versions of the Cellroute GSM Gateway. The Cellroute AC is a ingle SIM analogue GSM Gateway with a single RJ11 telephone port and supports a 2G SIM Card (ie operating on the 900/1800Mhz mobile phone frequencies). The Cellroute GPRS is the same specification as the Cellroute AC, but includes a built-in battery back up providing a telephone service in the event of of power failure. The Cellroute 3G is the same as the cellroute GPRS and inlcudes the battery back-up but operates on both the 2G (900/1800Mhz) and 3G (2100Mhz) frequencies so it can be used in areas that are covered by 3G voice networks.
The Cellfax Plus is a 2G GSM Gateway that provides voice calls, just like the Cellroute gateways, but also supports fax transmission, so can be used to send and receive faxes over the GSM network using a standard analogue fax machine connected to the telephone port of the Cellfax Plus Gateway. The cellfax Plus GSM Fax Terminal only operates on the 2G (900/1800Mhz) networks becuase these are the only networks that support fax transmission.