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Voice over Internet Protocol (VoIP) is a technology that allows you to make telephone calls
using a broadband Internet connection instead of a regular (or analog) phone line.
4.7.1 Protocol
You have to choose suitable protocol and specify SIP accounts for using VoIP.
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There are two protocols can be used for VoIP - SIP and MGCP. You should click either one
of buttons to set corresponding settings for VoIP phones. Be aware that both sides (local end
and remote end) should use same protocol for VoIP phones.
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Vigor3300V+ Series User's Guide