The SS7 signalling systems differ between European (ITU) and American (ANSI) standards. GSM operators require conversion between these standards to enable interstandard roaming.

Comfone provides a gateway to and from America and other countries operating ANSI standards, permitting customers to place or receive mobile calls and Short Messages (SMS) when they travel between the ITU and ANSI standards.

The signalling conversion service subsequently facilitates a seamless signalling service between the ANSI and ITU worlds, thus enabling operators to collect more roaming revenue by offering their subscribers a superior roaming service.