Abstract: A caller information providing system includes a caller device, a database and a receiver device, each of which is in communication with the network. The caller device has an identification code. According to the identification code, caller information of the caller device is provided by the database. The caller information of the caller device provided by the database is acquired through the network, and revealed by the receiver device.

Abstract: The present invention is to provide a communication system, which is adapted to employ a HTTP as a transfer protocol, and enables the VoIP device to issue required provision-request documents in XML syntax to a provisioning server of an ITSP over the Internet, the provisioning server then verifies the identification thereof. If the verification is true, the provisioning server retrieves setting parameters required to configure the VoIP device from a user database, stores the parameters in a provision-response package written in XML syntax, and sends the package back to the VoIP device. Then, the VoIP device performs a configuration on itself based on the parameters and proceeds with a registration to a call agent of the ITSP automatically.