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