4-151. In the screen, type ‘2’ and press [Enter].<<<<< PSTN Configuration Menu >>>>>[0] Gateway Operation Mode[1] PSTN Rerouting Insert Digit[2] PCM Method[3] Dial Method[4] SLC Signal[5] Trunk Signal[6] Call Control Method[7] Ring Cadence[8] System Tone Cadence[9] CO Tone Cadence[10] Gain Control[11] Diagnosis[12] MMC Port Block/UnBlock[13] Display Slot Configuration[14] Display Port Status[15] Save & Exit[16] ExitSelect ?22. screen is displayed. Type ‘0’ and press [Enter].
