VMG8825 B50B version 5.13(ABNY.2)C0 does not send caller id to gigaset AS405

Hi gif1234
I've just recently got exactly the same model router with same (latest) firmware version & am VOIP -ing with Sipgate.
I came to this forum because I have exactly the same problem as you, which I see you encountered at least six nmonths ago!. Funnily enough I'm using a Gigaset too - mine is the S79 series... but I'm certain that this isn't a relevant factor. Another guy I've already discovered with exactly the same problem is using a Panasonic cordless set.
I'm certain this must be a firmware bug. ...When using GBR as the region setting, incoming caller ID always displays on my 'phones for exactly two incoming calls before failing, but can be temporarily cured for just the next two incoming calls by rebooting the router before failing again. However, selecting a different rregion setting, such as DEU solves the problem & it works fine continuously. You just have to put-up with the non-native tone set!
My workaround for the last week has been to use DEU & put-up with the German tone set, but I've now switched to AUS 'cos the tones are closer to GBR (still using Europe Type call service mode).
My Gigabit broadband FTTH service provider is B4RN (Broadband for the Rural North) & this is now their standard issue router. ... I've taken this issue up with them & they agree my findings. As a significant Zyxel customer, now buying these by the thousands, they're hopefully going to have more success pursuing this issue with Zyxel than us mere individuals

Did this issue ever get resolved. I have the same problem using this router on Sipgate and am using the country code workaround but dont like the Aussie tones. I have Panasonic DECT phones so its not a Gigaset issue. Sipgate tell me they only get this complaint from customers using this Zyxel router so it must be an issue with the router. Surely after 16 months there is a fix for this.