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For a small business to build its own VOIP networks, just one centralized SIPSP-PBX is enough to provide services for all the phones within the whole company.
HOW?
Deploy one SIPSP-PBX server (Standard Edition) at the main office, with an optional SIPSP-IVR for Voicemail and ACD application . Let all the phones register to the SIPSP-PBX.
Benefits?
-- All the calls within the company are FREE.
-- The phones can be either allowed or forbidden to call PSTN via the PSTN gateway in the main office.
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