I just encountered a problem with my Gigaset 610ip. I have two handsets of this model and none of them is currently registering. I even went to delete them from the webadmin, reload router, re-add them ( as generec sip-phone, as I have always done before), but for the live of me, they won't register. The webadmin of the gigaset always shows the status of those phones as "registration failed".