Video on-demand has to do with the delivery what they call content, while the video phone is the deliver of person-to-person communication. These are not nearly the same, but they both involve video.

随需视频必须与传送他们所称的“内容“相关,而视频电话是一种,个人对个人的传送，那不是,大致相同的，但它们都包含视频。

麻省理工公开课 - 媒体、教育、市场课程节选

every sort of communication, e-mail, person to person,

各种交流沟通，电子邮件，面谈，

为何选那门专业？ - SpeakingMax英语口语达人