CAMEL is a Network Feature that is based on CAMEL Application Part (CAP) and Mobile Application Part (MAP). Most CAMEL implementations that I have worked on have MAP V3 and CAP V2 in the Network. This is used for PrePaid Voice Services. O-CSI flag is configured in the HLR / HSS / UDC Profile database.
Implementations of CAP V3 – for SMS – is based on CAP V3 and MAP V3.
Very few implementations of CAP V4.
Good if you can highlight your exact issue with MAP.