Control Codes for inward DTMF telephone dialling access are codes that perform specific functions, including: ·00 - Clear Last Entry—This code will clear the paths that were activated by the last selector code entry. If [00] is entered twice, the paths that were activated by the last two selector code entries will clear, and so on. ·91 - Send Call Signal—This code will send a call from the port to the matrix as if a call signal was sent by an external deviceconnected to the port. ·92 - Disable DTMF Decoding—This code turns off DTMF decoding.  This may be desirable because certain program sources may contain DTMF tones not intended to be interpreted as selector codes, and that can inadvertently reroute the audio path.  ·99 or 099 - Clear All—Either of these codes will clear all currently