Call flow information can build \u2018intent\u2019 into call flows having a series of intended steps and one or more alternative steps for selected intended steps. Each of the wheel arrangements includes two parallel wheels coupled together. Additional systems and structures are also presented. The rollup blade includes an upper electrode and at least two layers having different optical properties. The target bit rate differs for different groups. With the signaling method of the present invention, SCP can send INAP operations, such as PA, PCUI to instruct an external IP unit to play an announcement or collect user information, then an IP unit can send back the related operations back to SCP.