I'm on snap using their voip service with my vdsl and I was wondering am I the only one that gets this error? I have no idea what causes it, it seems to come and go from time to time.

The error I get on my fritzbox is: Internet telephony with [number]@connect1.plus.snap.net.nz via connect1.plus.snap.net.nz failed. Cause: Unauthorized (401)

Edit: forgot to note this issue has happened in the past but ever since I tried to set up DECT today, I have this 401 everytime on the ATA port & the DECT line as well.