The function of the private line eliminates the possibility of someone other than you reviewing your call details, from phone sets, which have the shared extension, additionally no one can monitor your call or connect to you call.
Brain21, Inc.
According to the various market evaluations, the IP telephony market is respected to beyond seven billion dollars annually including VoIP (Voice over IP) equipment, protocol stacks, and IP telephony services. As a major vendor of the market for IP telepho
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