Not exactly a tough problem to mitigate though:
1) Send a "state of the network" email daily or as required to all customers who would like to participate. This would detail known issues, incoming fixes, etc regardless of the region or product affected.
OR
2) Improve the above suggestion via targeted mailing lists. This should be possible since your customer's product and region (based on ADSL line number code or provided customer info at signup) should be known. Notification emails would only then be sent to those potentially affected by known issues.
OR
3) Add some detail to the website. Update it frequently detailing the known issues, incoming fixes as well as better equip your first line support by keeping them better informed of what's going on in the background.
The net result of any of the above should be less repetitive questioning here, fewer support requests for your first line support to filter and...best of all...fewer frustrated clients.