当我首次在IPKALL注册获取号码时,我是按如下方式填写的信息: SIP Phone Number: : sip.voipdiscount.com SIP Proxy: fwd.voipdiscount.com 现在按你的建议,“SIP Proxy填sip.voipdiscount.com”,IPKALL 的网页上会提示“Invalid verification codes.” 有何指教?谢谢!