Hi Dani, > IP adr 77.96.80.12 This looks like a public address, meaning your modem does not do any NAT at all. So perhaps the problem is not the double NAT, but NAT in the first place.
A bit of googling shows that NAT can indeed cause problems with SIP / Voip, but I'm not quite into voip so I don't have any details at hand. It seems there's all kinds of tricks that both the phones and the routers can do to prevent NAT from causing problems. It seems the Fonera at least has a module for SIP, but I'm not sure if that should be sufficient. Does the manual of your phone say anything about "NAT" or connection from "behind a router"? Gr. Matthijs
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