Hello, I can not reset to factory settings with the handy tone 486. The manual explains how to get to the reset menu and set the mac address, but it says invalid entry when I enter the first digit of the mac address. As I can solve the problem?

SOURCE: Secret block

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SOURCE: My handy tone-486 box keeps flashing red every 3

Lifted this straight from the manual:

Button flashes every 4 seconds
(if SIP server is configured)
HT–486 fails to register

So basicly, that means your HandyTone 486 ATA fails to register with the SIP-server. That means you either have not recieved your IP-tele yet, or that your ISP have failed to register you.