Analogue gateways were traditionally known as Premicells. An analogue gateway is generally just a mobile phone in a box that connects to your PBX on a spare line port.  An analogue unit is generally capable of operating only as a dedicated port, it does not possess any of the sophisticated minute management features used on the ISDN units.

However, correctly installed they are ideal for use in the SME environment, for routing mobile calls out, and in to the office on sharer packages. It is important to ensure that a spare line port per analogue unit is available, and once again the system maintainer will need to do some system programming to enable it to work correctly.