I still think server edition is the way forward.
Capabilities
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Expanded scale/capacity With a Linux server – Server Edition means seamless growth, … up from 384 users to 1000 per site; and 40 voice messaging ports to 100 all using the same Linux Server
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Centralized Management – Simple administration is the cornerstone of Server Edition. From the one intuitive interface, the System Administrator has one view of all users on a single site or across up to 32 locations. Using system status can, at a glance, let the Administrator know of any potential issues that could affect system performance such as over utilized trunk lines, voice ports, and bandwidth utilization
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Centralized Licensing – Server Edition holds all common licenses centrally, making it cost effective to purchase discounted license packs and easy for a System Administrator to assign user solutions to employees anywhere within the network
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Resilience built-in – midsize businesses demand reliability, Server Edition delivers. Within a multi-site network where Server Edition is deployed across remote locations, in the unlikely event of a system outage, the IP Phones on that location simply re-register to an alternate location. Voice messaging is also critical to many businesses; Server Edition backs-up messages and greetings to an alternate Linux server.
ACSS - SME
General Geek