一、话音VPN的发展背景 VPN对企业应用并不新鲜。目前不少公司,不论其规模大小,已经多年采用基于IP方式的VPN传送大量数据流。而企业内的话音流则通常通过租用线路进行传送。由于话音与数据传送分开,即使话音和数据业务由同一个运营商提供,企业也需要采用两条不同的专线分别用于企业内不同的应用,因此给企业通信费用较少的中小企业带来了较大的经济负担。 First, the development of voice VPN Background VPN is not new to enterprise applications. At present, many companies, regardless of their size, have been using IP-based VPNs to transmit large amounts of data streams for many years. Voice streams within the enterprise are usually delivered through leased lines. Because of the separate voice and data transmission, even though voice and data services are provided by the same operator, enterprises also need to use two different leased lines for different applications in the enterprise respectively, thus bringing SMEs with less communication costs Big economic burden.