We are still using our ISDN phone behind a FritzBox DSL Router. S0 Bus still works nicely and is much easier to setup compared to multiple VoIP phones in your h

We are still using our ISDN phone behind a FritzBox DSL Router. S0 Bus still works nicely and is much easier to setup compared to multiple VoIP phones in your house. Particularly supporting multiple phone numbers is nice. Actually all our phones we use are pre 2000s. The newer ones we had never lasted both in terms of design and tech. I think at work our Alcatel phone system also uses a modified version of the s0 bus (with numbers tied to the port )