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 the same uptime as a switched phone Dexter 56k , Dexter, ME 56k DexterDexter , 56k Maine, Dexter 56k
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