Hi Rizwan and Abhishek,
Apologise for my very late answer. I see that this question was raised in 2007.
CAMEL – Customised Application Mobile Enhanced Logic – is the embodiment of the Intelligent Networks (IN) concept for mobile networks.
CAMEL is bilaterally and specifically enabled across networks by roaming partners. It is supported by the CAP (CAMEL Application Part) and the MAP (Mobile Application Part) protocol.
CAP V4 represents the final revision of the CAMEL standards.
MT SMS can be found in the following 3GPP specification, below:-
3GPP TS 23.078, 3rd Generation Partnership Project;
Technical Specification Group Core Network and Terminals;
Customised Applications for Mobile network Enhanced Logic
(CAMEL) Phase 4; Stage 2
Feel free to Google the specification. It has a description / flows for MT SMS. Note that MO-SMS is supported by CAP V3.
VBR/ Wallis Dudhnath