Consider deployment with analog/IP gateway analog phone at a lower price, will transfer from VoIP network, rather than using IP telephone, the cost of every telephone may be in the $200 to $900) companies to cover every location, very likely scenario is that you need to simulate the gateway to support the fax machine that cannot run on IP link, if simple analog phone can in some areas, such as the corridor or terminal) to complete the task, it can save the cost, it is university and has hundreds of students' dormitory telephone has dozens of common practice in the hospital corridor and the examination room telephone,
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