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並前往https://support.microsoft.com/zh-tw/help/2596034/fix-a-sip-client-cannot-register-with-an-external-sip-server-when-you

FIX: A SIP client cannot register with an external SIP server ...

Symptoms. When you access an external Session Initiation Protocol (SIP) server through Microsoft Forefront Threat Management Gateway (TMG) 2010, the SIP ...

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