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1·The Centrex billing management system of Dandong telecommunication is a typical telecommunication service application system.

丹东电信虚拟网计费管理系统是一个典型的电信业务应用系统。

2·So everyone in your company can take advantage of Centrex features and services on a cost-efficient, call-by-call sharing basis.

它也可以被用来把中央服务，从电话公司的中央办公室向业务领域的成本效率。

3·CENTREX is an international purchaser from Andorra, need to buy products of Woven Goods, Gift, Ceramics, Adornment etc. categories.

该公司是一家国际采购商，来自安道尔，需要购买的产品类别包括：编织品、礼品、陶瓷、装饰品等。