One, the concept of VOIP phone/VOIP Internet phone
Second, the basic principle of VOIP phone/VOIP Internet phone
Three, the basic structure of VOIP phone/VOIP Internet phone
Four, the advantages of VOIP phone/VOIP Internet phone
The types of five VOIP phone/VOIP Internet phone
Six, the key technology of VOIP phone/VOIP Internet phone
Seven, VOIP phone/VOIP Internet telephony problems to be solved in
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