| International | |
| FreeWorldDial, NodePhone, SIP Discount, ZipDX |
| Algeria | |
| Awarnet |
| Argentina | |
| Crossfone, ILC System, IPLAN, Megavox |
| Australia | |
Engin, FaktorTel, Freshtel, Internode, MyNetfone Au00, MyNetfone Au10, 2talk, ACN Pacific, Exetel |
| Austria | |
| AHOOLY, sipgate, IPAustria, mywave, Peoplefone, telgo, Fairytel |
| Belgium | |
| 3StarsNet, Belgacom ITalk, Intertel telecom, MottoVoIP, Phonext, Toledo Telecom, Weepee, IPNESS |
| Bosnia | |
| - |
| Brazil | |
| Brasil Telecom, Brastel, DirectCall, Evoxclub, Global Village Telecom, Transit Telekom, UOL Voip, TMais, vono |
| Canada | |
| IdeaSIP, IRISTEL |
| Croatia | |
| 2call, Akton Voice, VoIP Direkt, voipBON |
| Czech Republic | |
Airess Cesko, FAYN Telecom, SIPY, VOLNY, VoIPEX |
| Denmark | |
Cellip, Foniris, Parlino, TelefonSelskabet, Telenor |
| Estonia | |
| Elion |
| Finland | |
Cubio, Communications, Parlino, Cellip |
| France | |
| 3StarsNet , afone_fr, Annatel Netw, Acropolis Tel, Bretagne Telecom, Flex Phone, Direct Centrex, Freephonie, France Telecom, Free IP Call, ippi, Keyyo, Ouest Télécom, PhoneSystems, Telecom Object, ukipservices, Voip Gate, VoxIP Telecom, WAZATEL, Wengo |
| Germany | |
| 1&1 , AHOOLY, easybell, Dus.net, freenet, GMX, Host Europe, Innovaphone, MottoVoIP, Nikotel, OmniVoice, OVH, QSC, sipgate, sipgate-team, sipSNIP, SKYTRON, Starface, T-Online, Ventengo |
| Greece | |
ephone.gr, OmniVoice, Viva Telecoms |
| Hungary | |
| MACROgate |
| Ireland | |
Blueface, IrishBroadband, eircom, ukipservices |
| Italy | |
Noverca, Eutelia VoIP, Cheapnet, Elitel, Messagenet |
| Liechtenstein | |
| Telecom |
| Luxembourg | |
| 3StarsNet, Intertel telecom |
| Macedonia | |
| - |
| Mexico | |
| Alestra |
| Netherlands | |
| 3StarsNet, 12connect, Agroportal, Budget Phone, Bevoip, BizzOnWeb, BelTex, Breezz, callpacity, Callvoip, Clearvoip, DIS-Telecom, Enterprisevoip, gnTel, Intertel telecom, MottoVoIP, newIP, SIP NL, Smile, Solcon, smart-tel, SpeakUp, Telfort, TNO, VoipBuster, VoIPPlanet, VoipQ, VoipHit, Voip Lite, VoipStunt, Voys Telecom, XeloQ Comm., Xs4all |
| Norway | |
| Cellip, Eniro, Parlino, Phonect, Phonzo, Telenor |
| Poland | |
| Actio.pl, easyCALL, FreecoNet, NewFon, neofon tp, PLFON, Tartel, Tlenofon, Set Neofo |
| Portugal | |
| Globe7, Pfingo, Telepac, Telepac PABX, SAPO |
| Romania | |
| Eurovoice |
| Russia | |
| Cubio Communications, SezamPro, SIPNET, Set Telphin, Teleoffice |
| Serbia | |
| eunet_rs, MediaWorks |
| Singapore | |
| Pfingo |
| Slovakia | |
| Dialtelecom, GTS Nextra, Slovanet, T-Com HCI, T-Com VVN |
| Slovenia | |
| VOIPme, Detel |
| South Africa | |
| GVSC, Internet Solutions, Switchtel, Vox Telecom |
| Spain | |
| Adam Telefonia IP, Anescu, BeOne, Carpo, Fastvoip, LCR, OVH, Talky, Telefonica, Twytel, VozTelecom, Vozelia |
| Sweden | |
| Axfone, Cellip, Digisip, JACKET, Parlino, Phonzo, Telia, Telenor, wx3 |
| Switzerland | |
| Bluewin, CityTel, e-fon, NetVoip, ITelecom, Peoplefone, Switzernet, Sipcall, VTX Telephony, Winet AG |
| Taiwan | |
| TFN, TTN |
| Turkey | |
| Dogan Telekom, Superonline |
| United Kingdom | |
Allobox.net, Callagenix, Connexin, Coms, Fastvoip, FreeWorldDial, GigasetSX76x, Globe 7, Gradwell, OVH, OmniVoice, Opal, Orbtalk, Pfingo, SIP Discount, sipgate team, Soho 66, Topland Hosted, Twytel, UKIPServices, V4 Ltd, VoiceFlex, VoiceHost, Voip4work, VoIP Unlimited, VoIP.co.uk, VoIPpfone, VoIPon, VoIPtalk, Wi-Manx, ZipDX |
| USA | |
| Gizmo5, IdeaSIP, ViaTalk |
| Vietnam | |
| AloVTC |