只要一位网络电话客户有加锁的配置菜单在h.264, h263, h263-1998 编解码器打可视电话,该解码器是与阿斯泰里克斯IP程控交换机配合工作的 .
（请参考阿斯泰里克斯：Asterisk is a software implementation of a telephone private branch exchange (PBX); it was created in 1999 by Mark Spencer of Digium. Like any PBX, it allows attached telephones to make calls to one another, and to connect to other telephone services including the public switched telephone network (PSTN) and Voice over Internet Protocol (VoIP) services. Its name comes from the asterisk symbol, “*”.
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