For cAP V3 there is a relationship between the gprsSSF (SGSN)and the gsmSCF (SCP). This is different from the Call Control that is used to control Voice / Telephony. Check that your CAMEL node is equipped, i.e.
configured, for CAP V3 Call Control. Maybe you just have a data License implemented that
allows you to use CAP V3 for pure GPRS sessions.
VBR/ Wallis Dudhnath