Why Does The Phone Line Crackle And Breakup When Using A Um185 Wireless Broadban

magicJack states:

A quality high-speed Internet connection will ensure a clear voice quality.
If you are using magicJack APP on your computer, please skip to step 2.

Step 1:
Please try connecting your magicJack to a different USB port and try again.

If you are using magicJack PLUS, please unplug it from the power source, wait 30 seconds, and plugg it back in.
If that does not work:  

Step 2:

Please turn off your modem and router (if you are using one) for 3 minutes. Then turn them back on again. Now unplug your magicJack and plug back it back in. After it starts up again, try to make a phone call.

If you are using the magicJack APP, please restart it by double clicking the icon on your desktop, after you have rebooted your modem and/or router.

If that does not work:

Step 3:

Right click on My Computer
Click Properties
Click the Advanced Tab
Under Performance, click Settings
Click the Advanced tab
Under Processor Scheduling, check the round button called Background Services
Click Apply
Click OK
Click OK again.

Now restart your magicJack and try a couple of calls to see if the quality improves.

If that does not work:

Step 4:

Please make sure that you have a good Ethernet cable connected from either your router/modem to your computer or from your modem to your router. Although some low priced Ethernet cables can handle Internet connections without any issues, they might affect the quality of your phone calls.

NOTE: If you are using the optional USB cord, please try without it. You may also try a different telephone with your magicJack or magicJack PLUS

If you can't resolve the issue, you can return the product per the instructions here.

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Hope this is useful. Please don't forget to click the Accept This Answer button if you do accept it. My aim is to provide reliable helpful answers, not just a lot of them. See https://www.helpowl.com/profile/Odin.

To fix a crackle when using Magic Jack Plus: 1) replace the AC USB adapter, 2) replace the USB extender cord if you can't plug the Magic Jack directly into the AS USB adapter, 3) replace the network cable that connects the Magic Jack + to the router.