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What can I do if I can hear a sound like a DTMF tone during the call without even pressing any key on the keypad?

  Background noise disturbance will generate the sound that can be pick up by the microphone on the handset.This issue is also common to hands-free device.In order to prevent the false detection of DTMF signal,you need to increase the DTMF actual detection threshold on the VoIP device by system configuration.

  If you are using OM20G/OM50G/OM80E/OM200G/OM500

  Go to Advanced- DTMF, then input 32 or 48 on DTMF detection duration increment against talk-off field(The range must be 16 to 240 in multiples of 16).

  If you are using HX4G/MX8G/MX60E/MX120G

  Go to Basic - System, then input 32 or 48 on the DTMF detection duration increment against talk-off field(The range must be 16 to 240 in multiples of 16).

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