Further, the open source telephony software can be used as a gateway or session border controller to provide network-based transcoding services.
此外，开源电话软件可以被用来作为网关或会话边界控制器，提供基于网络的转换服务。
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This session provides an overview of IPTV technologies, including video standards, broadcast technologyes, compression basics and trends, IPTV services such as broadcast video, VOD and network PVR.