this problem. The technician who installed your DSL service might have left some filters for you; if not, call your DSL provider or look in any electronics store.
Plug the DSL filter into the telephone wall jack and plug your phone’s base into the filter. Make a test call to make sure the noise is gone.
Changing from Tone to Pulse Dialing
Your phone can communicate with the telephone network in two different ways: tone dialing or pulse dialing. These days, most telephone companies use tone dialing. If your phone company uses pulse dialing, you will need to change your phone’s dial mode.
1)From a handset, open the menu & select Global Setup.
2)Select Dial Mode, then select Pulse. The phone sounds a confirmation tone.
If you use pulse dialing and you need to send DTMF tones during a call (if you're using an automated response system, for example), press 
to temporarily switch to tone dialing. When the call ends, the phone automatically returns to pulse dialing mode.
Resetting and Registering Handsets
If you are having trouble with a handset or if you want to replace one, you need to clear the registration information from the base and the handset:
Do you have the base the handset is registered to?
| Yes |
| No |
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|
1. | Press & hold End and # until the System | 1. | Press & hold End and # until |
| Reset menu appears (about 5 seconds). |
| the System Reset menu |
2. | Select Deregister HS. The display lists |
| appears (about 5 seconds). |
| all registered handsets. | 2. | Select Base Unavailable. |
3. | Select the handset you want to reset. | 3. | When the phone asks you |
4. | When the phone asks you to confirm, |
| to confirm, select Yes. The |
| select Yes. The handset clears its |
| handset deletes its own link |
| information from the base & deletes it |
| without contacting the base. |
| own link to the base. |
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When you reset a handset (or if you buy a new one), that handset displays a Handset Not Registered message. If you see this message on a handset, you need to register it to a base before you can use it.
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