buy Linksys SPA3000 或SPA3102, connect SPA3102 as this link

http://www.voiptuts.com/2010/12/cisco-linksys-spa-3102-voip-gateway.html 

在精华区 search SPA3102，有很多帮助。Localphone 安装图http://help.localphone.com/voip/devices/hardware/linksys/spa3102

照Sipgate http://www.sipgate.com/faq/article/397/How_do_I_set_up_my_VoIP_device

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