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What troubleshooting have you done so far?
Nothing
Try resetting it please. Switch the mains power off, wait five seconds and then turn it on again
Its Advanced phone Ztwin
Noted
The Secrecy or Mute feature has probably been turned on. When the Secrecy or Mute feature is turned on, some cordless phones will show Secrecy On or Mute On in the handset display.
Please, follow the next steps to turn Secrecy or Mute off: You can turn it off from the main menu after dialing 1572 from your landline phone.
Is everything clear with the provided instruction?
Yes thank you Ok
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