On Fri, Nov 02, 2018 at 03:06:56PM +0100, Yves Glodt wrote: Is that using LuxFibre or Tango's own last mile (possibly a P&T fibre leased as dark fibre by Tango)? Yes, that's how the Fritzbox does it. You "just" have to extract the correct SIP username, password, hostname, etc. Maybe from a working (preconfigured) fritzbox, maybe by connecting the Fritzbox to a GNU/Linux machine instead of directly to the fiber ONT and sniff the DNS and SIP traffic. That's how my notes say it happens on LuxFibre lines; Tango might have different VLAN numbers, but my guess is not. Again, configuration of a working Fritzbox or sniffing the traffic will tell. The SIP traffic goes to VLAN number 39, and you get an IP address by DHCP. However, with my provider, the SIP server is perfectly reachable over the "common normal" Internet connection, and I didn't easily / quickly manage to force RTP traffic linked to SIP to go over VLAN 39. It was just easier to let it go over the normal Internet connection, and that's what I did. Worked like a charm. I now notice it doesn't work anymore. No IP address from DHCP. They must have changed the configuration parameters without telling me. That shows you how much I actually use that SIP line. Maybe they don't use VLAN 39 anymore. Dunno. -- Lionel