Hello,
There is a solution to have Asterisk connected to SIP on Swisscom “legally”. It’s called ESIP. It’s a Big Business product that can also be obtained from SMEs. It involves some effort and knowledge but it is quite possible even if some say that not because they think mass market and Smart-Buesiness-Connect.
The price of the product makes it very peritnent also vis-a-vis the other services and suppliers.
I-communic8