MRBT是一种采用多媒体作为回铃音的增值业务.多媒体彩铃是一种基于被叫,展示在主叫终端的业务.本文结合3GPP LTE下的VoLTE话音解决方案和多媒体彩铃的业务属性,提出了一种具有QoS保障的VoLTE彩铃实现方案,包括系统的设计和基于会话的SIP信令,并对资源预留机制中的关键部分给出示例.%Multimedia Ring Back Tone (MRBT) service is a value-added service that makes multimedia as the ring back tone. MRBT is a service based on the called and display on the caller. This paper, with the VoLTE and the business property of MRBT, propose a QoS guarantee implementation program, including system design and session-based SIP signaling, and give examples of the key part of precondition mechanism.
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