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.
VoIP Terminations and Hosted VoIP Switch Partition : VoIP Reselller, VoIP Callshop, VoIP Calling Cards, VoIP Callback, VoIP PC-To-Phone, VoIP Device-To-Phone, DID, E-Commerce, etc.