Method for identifying a relay center msc and method and device for group calling.

A method for group calling, comprising: building a setup message call using a number of Center Mobile Services Switching Relay as a call number 5 Center Mobile Services Switching Relay, so that the center Mobile Services Switching Anchor can identify the center of Mobile Services Switching Relay, where the subscriber is calling service, when a subscriber 10 call service initiates a group at the center for Mobile Services Switching call Relays and sending the call setup message to a Mobile Switching Center Services Anchor.