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| Tarifica | www.tarifica.com |
| Tariff tracker | www.oceansolutions.com |
| CO finder | www.cofinder.com |
| NANPA | www.nanpa.com |
| Anatel | www.anatel.gov.br |
| CRTC | www.crtc.gc.ca |
| FCC | www.fcc.gov |
| ITU-T | www.itu.int |
| Network magazine | www.networkmagazine.com |
| Telefônica | www.telefonica.com.br |
| Telemar | www.telemar.com.br |
| Embratel | www.embratel.com.br |
| Vesper | www.vesper.com.br |
| Brasil telecom | www.brasiltelecom.com.br |
| AT&T | www.att.com |
| BellSouth | www.bellsouth.com |
| Qwest | www.qwest.com |
| Telmex | www.telmex.com.mx |
| Equant | www.equant.com |
| Worldcomm | www.mci.com |
| Telus | www.telus.com |
| Bell Canada | www.bell.ca |
| AT&T Canada | www.attcanada.com |
| British Telecom | www.bt.com |
| France telecom | www.francetelecom.com |
| Telefônica de Spana | www.telefonica.es |
