Mandatory Parameters
In addition the Global Mandatory Parameters, the following parameters must be included:
type: The type of routine being called.
- Should be set to 'check_destination'.
- Value is not case-sensitive.
to: The international dialling code of the destination country being queried.
- Any number beginning with the country's dialling code can be used, e.g. ISDN/MSISDN. In any case, it is only the first few digits that are taken into consideration.