A database of call information may be generated based on called numbers. The bit rate of the client signal is increased such that the client signal has the code information block and an empty area comprised of b bytes, and the ratio ca is equal to or higher than 110% to create a code block 3 comprised of c bytes. The tiles forming the lining surface are securely held in place as a result of the selective deployment of the locating rods into a gap in the adjoining structure. The message defines the desired rate constraint and the number voice frames to be constrained.