Patent ID: 9578180
Date: 2017-02-21
CPC Classifications: H04L,H04M

Claim:
1. A communication network system, comprising: a called terminal; a calling terminal, being configured to generate and transmit an invite message including IPv4 (Internet Protocol version 4) connection information and IPv6 (Internet Protocol version 6) connection information of the calling terminal, the IPv4 connection information having an IPv4 address of the calling terminal, the IPv6 connection information having an IPv6 address of the calling terminal; and an SIP (Session Initiation Protocol) server communicatively connected to the called terminal and the calling terminal, being configured to receive the invite message from the calling terminal and directly forward the invite message to the called terminal; wherein the called terminal establishes a voice call with the calling terminal according to one of the IPv4 connection information and the IPv6 connection information of the calling terminal, if the called terminal is assigned with only an IPv4 address, then the called terminal uses the IPv4 address of the called terminal to receive the voice call from the calling terminal, and if the called terminal is assigned with the IPv4 address and an IPv6 address of the called terminal, then the called terminal uses the IPv6 address of the called terminal to receive the voice call from the calling terminal.