原帖由： bingcheng zhou ,
In its operation instruction, the one of problems is stated as: "This product is unable to make calls when: – the handset batteries need recharging or have failed. – there is a power failure." Since the problem is not about the power, it may follow this condition: "If you cannot make calls, change this setting according to your telephone line service. The default setting is “Tone”. “Tone”: For tone dial service. “Pulse”: For rotary/pulse dial service. 1 [MENU]#120 2 Select the desired setting. 3 [SAVE] and [OFF]"