If you're getting a dial tone that sounds different from your normal dial tone, it's likely to be one of the ones listed below. Have a listen to see if it's what you're hearing on your home phone:
The Stutter Dial Tone is exactly what it sounds like - a dial tone with a 'stutter', or intermittent pulse. You get this dial tone when you have a new message on your MessageBank or Home Messages 101 service. To remove this tone, you need to call your MessageBank or Home Messages 101 service to listen to your new messages.
The Facility Tone indicates that one of your phone features, such as Call Forward, is active.
The Congestion Tone indicates that the network is congested. Try calling again later.
The Call Waiting Tone, when heard during a call, indicates that an incoming call is waiting.
If you're hearing a hissing noise over your dial tone and use ADSL, your ADSL line filter may not be fitted correctly.