SIP Provider AT/CH
- SIP Provider Plusviereins (CH)
- SIP Provider 4TS (CH)
- SIP Provider A1 Telekom (AT)
- SIP Provider Drei (AT)
- SIP Provider IP Austria (AT)
- SIP Provider myTweak (AT)
- SIP Provider net-cloud (AT)
- SIP Provider Netvoip (CH)
- SIP Provider Nexphone (CH)
- SIP Provider PCH (AT)
- SIP Provider Tele2 (AT)
- SIP Provider T-Mobile Austria (AT)
- SIP Provider peoplefone (CH)
- SIP Provider Quickline (CH)
- SIP Provider sipcall (CH)
- SIP Provider SolNet (CH)
- SIP Provider Sunrise (CH)
- SIP Provider Swisscom (CH) - Enterprise SIP
- SIP Provider Swisscom (CH) - Smart Business Connect
- SIP Provider Swisscom (CH) - Business Connect
- SIP Provider UPC Cablecom (CH)
- SIP Provider UPC Cablecom, Registered (CH)