This is a list of commercial voice over IP network providers, arranged alphabetically with no restriction to region. Only operating providers with customers should be included. See also Category:Free VoIP software.
Adams Cable
AIM Phoneline
AIM Call Out
AT&T CallVantage
Bellshare (Germany and USA)
Broadvoice
BT Group (UK trading as BT Broadband Talk)
Cable & Wireless (Global product)
Cbeyond
Clearwire (only for Clearwire Wireless customers)
Charter Communications
Comcast Digital Voice
Covad (ClearEdge Office, Pro and Integrated access)
Cox Communications (Northern Virginia)(Parts of Rhode Island)
Deltathree (Global)
Engin (Australia)
FaktorTel (Australia)
Gizmo Project (SIPphone)
iTalkBB
Jajah (connects two regular telephones)
Lingo
Mediacom
Modern Telegraph
Net2Phone
ntl:Telewest Business (part of Virgin Media)
Packet8 (8x8)
Parlino
Primus Canada
Qwest Communications
Sipgate (Germany, Austria, UK)
Shaw Communications
Skype
Speakeasy
Suddenlink Communications
Teamspeak
Tesco (UK)
Truphone
Time Warner
Vbuzzer
Verizon VoiceWing
VoicePulse
Voipfone (mainly UK)
VoipStunt
Vonage
Voxbone
Vyke
Wengo
Windows Live Call
WOW - Internet Cable Phone
Yahoo - Voice