internet disconnects with incoming call

If your internet is getting affected by your telephone service, either one of two things is happening...

1- If you have DSL, ensure that ALL devices connected to your phone line EXCEPT for the DSL modem is properly filtered. Every telephone, fax machine, dial up modem, satellite box, alarm system, and any other device connected to the phone line needs to be filtered (of course except for the DSL modem it self)

On occasion the DSL signal may still leak thru a filter, so with some installations you may require adding 2 filters to your phone line...

2- You are using a 2.4Ghz cordless telephone, and have wifi. If this is the case, before you run out and replace your telephone there are a few things that you can attempt to resolve this issue. First try to change the channel that your wireless router operates on. Normally the address for your router is located at http://192.168.1.1 but if this is not the address for your modem, then you can go to the start menu and type in CMD then hit enter at the command prompt type in IPCONFIG and then hit enter look for the default gateway, and enter those numbers into your browser.
The standard default user ID and password combinations are:
User ID: admin
Password: admin =or= password =or= just leave blank
if none of these combinations work, you will have to search for the default password to your router in the manual, or online. Sometimes the password may be located on the router itself.
Once logged into the router, look for the wireless settings and change the channel that the wifi operates on. You do not need to change the settings for the devices that connect wirelessly to your router, if this is the only setting that you change. Changing this setting should reduce or eliminate the trouble between your 2.4 Ghz phone, and you wireless router.

If you continue to have problems with the above troubleshooting tips, try moving your cordless phone further away from your wireless router, and/or plugging it into a different power outlet. If all else fails, replace your 2.4Ghz phone with a 5.8Ghz phone, or a 1.9Ghz DECT phone.