SIPP codes are a standard in car rental created by ACRISS.
The aim of SIPP codes is to make it easier for users to compare different makes and models of vehicles. The use of SIPP codes is not mandatory, but advisable.
SIPP codes are also called ACRISS codes. Generally, it is recommended to use the term ‘SIPP code’ rather than ‘ACRISS code’.
SIPP stands for Standard Interline Passenger Procedures.