Hi,

i live in Germany and am with an ISP that ships pre-configured Fritz
Boxes to their customers. Thanks to openwrt i do not have to deal with
this box.
These boxes seem to have a feature where VoIP uses a different VLAN
between ones home and the ISP. Luckily i can use sip on the regular wan
interface (VLAN tagged pppoe).
But still i am wondering how this second VLAN for VoIP works and whether
it might be worth setting it up in openwrt. The reason behind the VLAN
is most likely QoS, and that might be nice to have.

Here is what i assume/guess, please correct me:
Using a second VLAN on my wan interface will essentially give me
another wan interface (wan.voip). I would have to run another pppd on
wan.voip, receive some sort of local address and route all sip traffic
over that interface.
The FritzBox seems to do the routing by protocol, using an
internal option called "route_always_over_internet".
I would not want to route all my sip traffic over wan.voip, since that
would make my ISP filter out my second VoIP account. And after saying
that i am actually wondering whether the whole thing is just about
locking out competition and not QoS.

regards,
Henning
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