designing your system from the ground up. They are complete phone systems, usually with options that include many of the IP telephony applications, such as managing your phone from your desktop PC, multi-line call control and automatic call distribution. IP PBXs are usually NT servers with telephony software and voice cards. Some disadvantages are the ability to scale the system and a dial tone that's dependent on NT, which doesn't offer dial up internet access, up internet access dialup internet access, dial, dial up internet access
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