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The answer is no since ComNet does not allow double registration. In most cases, we usually install ComNet SIP phone in our personal Asterisk box and then use other SIP client such as Zoiper to register the Asterisk box. With this arrangement and you only need single registration for making calls from different SIP devices.

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其实我把ComNet Phone注册在我的Asterisk Server, 然后用Zoiper去register我的Asterisk，那么通过Zoiper去拨打香港电话。如果你在大陆和用ATA直接reg ComNet Phone的server，有的时候能reg到，但是有的时候会failed，主要是大陆电信商，知道你用VoIP，而Server在香港，所以把你的connection （SIP）dropped掉！