This reports the traffic type, constant or variable bit rate, signaled for this SVC during call establishment, a companion field to cktSvcAalType and cktSvcBBearerClass that the admin can cross-check for internal consistency across a given call's negotiated parameters. For example, an SVC showing cbr(2) here should also show aal1(1) and class-A(2) in the related SVC fields; a mismatch among these, say vbr(3) here but aal1 elsewhere, would be worth flagging as an unusual or possibly misbehaving call setup from the originating equipment.