English英语译成Chinese汉语 技术/工程设计 电脑：系统、网络

Large companies can be split into two different scenarios: distributed organisations with a number of branch locations where the cost of running PBXs at small locations and maintaining staff to support them would be considerably more than paying a carrier do it all centrally; and large office sites where staff frequently move around desks or from home, and are often in city centre locations where communications rooms take up expensive floorspace. In both cases, the larger the organisation, the more experience it has with negotiation outsourcing contracts and reading between the lines of an SLA.
At the opposite end of the spectrum, there are small- and medium-sized businesses. Bearing in mind their comparative lack of telecoms experience (to buy and maintain a PBX), uncertain futures (will they grow or contract) and being extremely cost conscious (opex preferable to capex), you would may think that many would want to outsource? Market watchers AMI Partners estimates that IP telephony spending among SMEs worldwide will amount to US$1.2 bn by the end of this year. However, a mighty US$1.1 bn of that is accounted for in IP PBX and IP phones. Just over US$100 m is accounted for in VoIP services. So much for the theory.