This page is no longer actively maintained but please feel free to report any dead links & I will update or remove.
| Service Providers VoIP to PSTN | Protocols | Special Features |
| Gossiptel | SIP | |
| Gradwell | SIP | |
| Nufone | SIP, IAX | |
| SIPCall | SIP | |
| SIPphone | SIP | 5 Free minutes |
| StanaPhone | SIP | Free New York number |
| VoIPJet | IAX | |
| VoIPTalk | SIP, IAX | |
| Voip User | SIP | Free Outbound Calls |
| Service Providers Other | Protocols | Special Features |
| Call.me.uk 04 | n/a | DNS delegation for VoIP numbers |
| Call UK | n/a | Free UK 0870 number to FWD Account |
| e164.org | n/a | Public ENUM root for use with VoIP systems |
| FWD | SIP, IAX | VoIP to VoIP Calling |
| IAXTel | IAX | 1-700 IAX Only Numbers |
| IPKall | n/a | Free Washington state phone number |
| Speak2world | SIP | Free UK 0870 to SIP, SIP Proxy service |
| Voip User | SIP, IAX | Free UK 0871 & 0844 to SIP or IAX |
| XtraPhone | n/a | Free UK 0870 number to FWD Account |
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