Adaptive network address translation (nat) method and apparatus for voice over internet protocol (voip)

An adaptive network address switching method for VOIP, applicable to a registration server, wherein the network address switching method comprises:

• receiving a registration request initiated by a phone, wherein the registration request is initiated by the phone based on a third public network address and a third port;
• the third public network address and the third port are generated by the phone by mapping a fourth public network address and a fourth port based on a connection status between the phone and a STUN server;
• and the phone obtains the fourth public network address of the STUN server by setting a field, and establishes a connection to the STUN server through the fourth port;
• and
• respectively updating a public network address and a port of the phone to the third public network address and the third port based on the registration request, whereby a call center establishes a connection to the phone through the third public network address and the third port.

An adaptive NAT apparatus for VOIP, applicable to a phone, wherein the NAT apparatus comprises:

• a first preprocessing module, an information obtaining module, and a first registration module, wherein
• the first preprocessing module is configured to obtain a first public network address of a STUN server, and connect to the STUN server through a first port;
• the information obtaining module is configured to obtain a second public network address and a second port based on a connection status with the STUN server, wherein the second public network address and the second port are generated by the STUN server or a registration server through mapping based on the first public network address and the first port;
• and
• the first registration module is configured to initiate registration with the registration server based on the second public network address and the second port, whereby a public network address and a port of the phone in the registration server are respectively updated to the second public network address and the second port, and then a call center establishes a connection to the phone through the second public network address and the second port.