GSM
GSM 缩略自： global system for mobile communications
- GSM
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Observe this table only deals with GSM systems.
en.wikipedia.org It was primarily marketed as a business phone and for some years was the dominant GSM device in the corporate world.
en.wikipedia.org The software looks at the GSM radio network from where the customer is calling and assesses the amount of capacity available in the network.
en.wikipedia.org This is similar to what GSM providers use for their voicemail systems.
en.wikipedia.org But, unlike the GSM standards, does not specify any internal aspects of the fixed network itself.
en.wikipedia.org