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