This is way easier when you have a old #FritzBox and then use #DreamPi and a good #VoIP provider like #DUStel...
The trick is to have #T38 support (aka. #Fax Support) because that works.
@nkizz personally, I can recommend #DUStel which are basically free [only prepaid as-you-go] when you import a number to them, but that's only an Option for residents in #Germany...
Same for Sipgate & Simquadrat as they left the USA in 2013...
Testen Sie den DUStel starter kostenlos, mit dem Sie bereits umfangreiche Leistungen bekommen + Startguthaben von 30 Minuten fürs Telefonieren ins deutsche Festnetz. Mit dem DUStel complete erhalten Sie ein umfangreiches Leistungspaket inkl. einer Flatrate ins deutsche Festnetz, sowie Rufnummern und SIP-Anschlüsse. Mit DUStel business flex stellen
@tt WTF?
1. You mean modem, right?
Cuz I'd not remove my #pfSense nor trust any ISP to keep their #CPE safe and secure.
2. I guess you didn't got upgraded to Business Internet Pro Cable?
https://www.vodafone.de/business/festnetz-internet/internet-anschluss-business-internet-pro.html
3. Personally I migrated my lines away from #Vodafone to #DUSnet for #VoIP and only pay outgoing calls and one-time €5 per number for getting them ported to #DUStel...
https://www.dus.net/de/privatkunden/dustel-starter
Kevin Karhan 
Kevin Karhan 
