Below are some remedial actions for when you don't hear a dial tone:Check whether or not you are connected with a filter.If yes, remove the filter and test to see if the issue persists.If this resolves the issue you will need to replace the filter you’re using.Cabling:Check to make sure that your devices are plugged in correctly.Check the curly cord and make sure that it is plugged into the receiver correctly.Ensure that the power cable is plugged in.Hardware:If possible try to test a different handset or cable to see if it's a hardware issue.If this resolves the issue you will need to replace the handsets or cables.For further assistance please contact our onboarding team at voipcare@bonline.com