Method and system for implementing local call local switch

A system for implementing local call local switch comprising a mobile switching center (MSC) and a base station system (BSS), wherein,

• the MSC comprises:
• a MSC calling processing module, which is configured to:
• receive a call establishment request of a calling user and transmit a local reference of an associated call to a BSS at a calling side BSS and a MSC at a called side;
• and
• a MSC called processing module, which is configured to receive a local reference of an associated call and transmit the received local reference to a BSS at the called side;
• the BSS comprises:
• a BSS calling processing module, which is configured to:
• receive and store the local reference transmitted by the MSC at the calling side;
• and
• a BSS called processing module, which is configured to:
• receive the local reference transmitted by the MSC at the called side, judge whether local switch can be triggered according to the received local reference, and execute the local switch when determining that the local switch can be triggered;
• wherein
• when the MSC at the calling side of the call and the MSC at the called side of the call are the same MSC, the MSC calling processing module transmits the local reference to the BSS at the calling side through an initiation message or an independent notification message;
• and
• when the MSC at the calling side of the call and the MSC at the called side of the call are different MSCs, the MSC calling processing module transmits the local reference to the MSC at the called side through the initiation message or the independent notification message.