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For ISP to upgrade his VOIP services to a larger scale, just add more SIPSP-PBX servers , as well as a central SIPSP-Proxy server.
HOW?
To scale your VOIP service, just take the following steps according to your need:
-- First, you can upgrade your SIPSP-PBX version to larger versions, like 500 or 2000 or more user version
-- Next, you can deploy multiple SIPSP-PBX servers to provide service for more customers
-- Later, when more and more SIPSP-PBX servers are deployed, you can add a SIPSP-Proxy as a central call router to make the whole system easy to manage and more scalable.
Benefits?
-- Gradually upgrade to an adequate scale whenever you need, without excess cost.
-- Unlimited scalability is available to fit extremely large scale of services.
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