VoLTE是运营商在4G下的目标话音解决方案,在LTE覆盖范围内通过LTE网络提供基于IMS的话音业务,同时通过锚定和域选功能,实现VoLTE用户在CS覆盖下的主被叫业务.本文分析了现网VoLTE被叫的信令和媒体流路径情况,发现了路径迂回的问题,并且提出了一种利用S-CSCF的增强功能来实现信令和媒体流的最佳路径,经过测试验证,该方法很好地解决了路径迂回问题,缩减了端到端的接续时延.%VoLTE is the target speech method in 4G solution, within the coverage area of the LTE voice is provided by LTE through the IMS network, the anchor and domain selection function is used to ensure the call when the UE is in CS. This paper analyzes current VoLTE signaling and media lfow path, found a path detouring problem, and proposes an enhancement to achieve the best path signaling and media stream using S-CSCF, after the test, the method solves the problem of the problem, reduces the end-to-end connection time delay.
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