The DECT standard fully specifies how a portable unit, such as a cordless telephone, can access a fixed network using radio waves. It is different from other standards like GSM in that it does not say how the fixed network is made. The communication with the fixed network is done through a base station which is called "Radio Fixed Part", and terminates the radio waves. The base station then uses a gateway to connect the calls to the fixed network. In most cases, the connection will be to the telephone network. Certain units also allow a connection to newer technologies, such as Voice over IP. Some baby phones also use DECT technology. Such baby phones do not have a gateway.