Yes those star codes are for "dumb" phones - for example if you want to transfer a call you would have to have the phone send something like "*77123" if you want to transfer to 123. Many devices have a local dial plan that tells the device when the sequence is done, for example you would have to enter "*77123#" to tell the device when the sequence is finished or use a timeout. You could also use a flash key, but then you would have to set up the device to recognize that key sequence.