This read-write flag forces this end of the circuit into the 'callee' (responder) role for Multilink PPP negotiation, the mirror image of cktMPForcedCaller, again in service of the PVC Attributes Modification Feature. Pinning the role avoids ambiguity or negotiation failures when both ends might otherwise attempt to negotiate the same role, particularly after an AMF-triggered attribute change needs to happen predictably. An engineer setting up a remote-site circuit to always answer rather than initiate multilink negotiation toward the hub would set cktMPForcedCallee to isMPForcedCallee(1) on that branch-side circuit.