VoIP is not a new technology, as early as in 2000, before and after the domestic telecommunications carrier
Business began offering to h. 323 way VoIP business, then the VoIP main needle
For long-distance phone service, traditional PSTN long-distance connection into IP connection, thus
Reduce prices, and since 2004, with the popularization and wide domestic broadband access
Continue to fall with the access fee, VoBB began to become the mainstream of application based on SIP,
Thus formed a serious threat to the traditional voice services,
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