SIP Trunk Provider in Switzerland

I need some Information from Sangoma.

Which Sip Trunk Provider is good for PBXACT in Switzerland.

I dont have experience with Switzerland, but i investigated already a lot of time into the country number system.

I want to host the PBX in the Cloud in Germany and integrate the Swiss trunk into the PBX.

My problem is that most of the providers only sell trunks in combination with a Internet Access and let them work only local in the house of the customer with fixed ip.

Is there any recommenced sip trunk provider which Sangoma is working with? The provider should have good trunks and affordable prices.