Method for implementing dual-homing

A method for implementing dual-homing, comprising:

• setting each one of any two Media Gateway Control Function (MGCF) entities as a standby for the other MGCF, each MGCF managing at least one Media Gateway (MGW);
• determining whether the MGW needs to register to a standby MGCF or not, if the MGW needs to register to the standby MGCF, upon detecting a new MGW registration, the standby MGCF activating or setting up all the signaling links related with the MGW, and refreshing the route information of the called party;
• if the MGW doesn't need to register to the standby MGCF, returning to the step of determining whether the MGW needs to register to the standby MGCF or not again.

A piece of controlled equipment in dual-homing, wherein the controlled equipment is used for sending a heartbeat signal to its home equipment periodically in a normal state, detecting a returned heartbeat signal from its home equipment;

• the controlled equipment is further used for sending the heartbeat signal to the home equipment periodically if receiving a normal heartbeat signal returned from the home equipment;
• the controlled equipment is further used for initiating a dual-homing switch to mutual-aid equipment of its home equipment, taking the mutual-aid equipment of its home equipment as its new home equipment, and sending the heartbeat signal to the new home equipment, if the controlled equipment does not receive a normal heartbeat signal from the home equipment within a pre-defined time, or interrupt time of the returned heartbeat signal from the home equipment is larger than a set threshold.

A system for implementing dual-homing, comprising:

• first home equipment and second home equipment, which are set as a standby for each other;
• a piece of controlled equipment belonging to the first home equipment or the second home equipment, setting its home equipment as primary home equipment, setting mutual-aid equipment of its home equipment as standby home equipment, connecting the primary home equipment and the standby home equipment with a primary link and a standby link respectively, if the primary home equipment is in a normal state, the primary link being activated and the standby link being inactive;
• if the primary equipment is in an invalid state, the standby link being activated and the primary link being inactive.