SIP-addressing is logical, of the same type as URL in HTTP. And the most natural – to use the electronic mail as the SIP address. There are permissible varied parameters by the address: for example, it is possible to indicate the regular city telephone number, additional telephone, and the parameters of modem connection etc.
iVox Communications is a privately funded company, formed in 2004 to build a national VoIP carrier grade network and provide wholesale services to internet and telephone service providers.