Hi, I've installed some asterisk based SIP gateways for some VoIP providers during the last weeks. Since those providers want to allow their customers free calls to subscribers of other VoIP providers, I had to put the provider codes into the dialplan, like +0700 for IAXtel. I found it helpful having a list of all the known codes somewhere in the internet, but found only very partial lists. Now, I started a list on my own. If you think it may help you, please use it: http://voip-providers.org Roger.