SIP calling refers to the use of SIP to make and receive phone calls over the internet. SIP calls can be made to and from traditional telephone numbers, as well as other SIP addresses. SIP is often used to enable voice over internet protocol (VoIP) communication, which allows users to make phone calls using a broadband internet connection rather than a traditional analog phone line.

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If you know the enemy and know yourself, you need not fear the result of a hundred battles Sun Tzu