Abstract: A method for implementing Ring Back Tone (RBT) interworking, a Media Gateway Control Function (MGCF) device, and an Application Server (AS) are provided. A Multimedia Ring Back Tone (MRBT) service is triggered when a Circuit Switched (CS) user originates a call to an MRBT subscriber in an Internet Protocol Multimedia Subsystem (IMS). The method includes: receiving a message sent by an MRBT AS, where the message carries video RBT information; and notifying a Mobile Switching Center (MSC) to put through a calling terminal if determining that a video RBT needs to be played to the calling terminal according to the message. Therefore, a video RBT can be played when a CS user originates a call to an IMS user in the case of network interworking. An IMS video RBT may be played to the calling party when the CS user originates a call to the IMS user.

Abstract: A Multimedia Customized Ring Back Tone (MRBT) service platform, a terminal and a system for implementing an MRBT service are provided in the present invention. A method for implementing an MRBT service is further disclosed, which includes: performing, by a Multimedia Ring Back Tone (MRBT) platform, a first media capability negotiation with a calling party before a called party answers a call after the calling party initiates the call to the called party; playing, by the MRBT platform, an MRBT for the calling party according to the result of the first media capability negotiation. The scheme of the present invention may implement an MRBT service in a 3G communication network.

Abstract: A method for implementing Ring Back Tone (RBT) interworking, a Media Gateway Control Function (MGCF) device, and an Application Server (AS) are provided. A Multimedia Ring Back Tone (MRBT) service is triggered when a Circuit Switched (CS) user originates a call to an MRBT subscriber in an Internet Protocol Multimedia Subsystem (IMS). The method includes: receiving a message sent by an MRBT AS, where the message carries video RBT information; and notifying a Mobile Switching Center (MSC) to put through a calling terminal if determining that a video RBT needs to be played to the calling terminal according to the message. Therefore, a video RBT can be played when a CS user originates a call to an IMS user in the case of network interworking. An IMS video RBT may be played to the calling party when the CS user originates a call to the IMS user.

Abstract: A Multimedia Customized Ring Back Tone (MRBT) service platform, a terminal and a system for implementing an MRBT service are provided in the present invention. A method for implementing an MRBT service is further disclosed, which includes: performing, by a Multimedia Ring Back Tone (MRBT) platform, a first media capability negotiation with a calling party before a called party answers a call after the calling party initiates the call to the called party; playing, by the MRBT platform, an MRBT for the calling party according to the result of the first media capability negotiation. The scheme of the present invention may implement an MRBT service in a 3G communication network.