The ZyWALL USG 20 phones home daily to ZyXEL supposedly to verify the status of any supplemental licensed products even when there were never any installed or currently registered. There is no provision to disable this "feature." Technical Support suggested that ZyXEL wants to monitor the status of the devices for unspecified reasons but could not identify what information is actually sent.
If you prefer that your equipment not to report back to ZyXEL just to stay in touch, please send a note to that effect to firstname.lastname@example.org and refer to case number 147179.
It sounds interesting. Thank you, u475700 for heads up. I don't run this model right now. Can anybody else check and confirm that too?
The last thing one would expect (or wants to discover) from router is that it phones to some host on the Internet without explicit permission of its owner... -- Keep it simple, it'll become complex by itself...
I happened to see these messages in the log and then called ZyXEL technical support:
notice myZyXEL.com Do expiration daily-check has succeeded. EXPIRATION_CHECK error myZyXEL.com The product has not been registered yet. EXPIRATION_CHECK info myZyXEL.com Time is up. Do exipration daily-check. EXPIRATION_CHECK