Talk:Customized Applications for Mobile networks Enhanced Logic
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More details are available in http://www.c7.com/ss7/whitepapers/meskauskas_camel.pdf with the basic information on CAMEL information.
Phase 3 and 4
My understanding is that CAMEL ph3 was largely about adding SMS control support to the protocol (IDP for SMS, Continue SMS, Release SMS and so on). Phase 4, although I haven't looked hard at it, seems to be going in the direction of INAP CS2, with more advanced call control (initiate call attempt, merge call legs, and so on) - check out 3GPP Voice Call Continuity paper, which cites CAP ph4 as being a possible, but discounted, solution for VCC. Discounted, I would imagine, because CS2 never took off; little support in the switches.