Allows users tracking the condition of the other telephone or the subscriber, for example, there will appear a signal on the screen of the telephone device informing that the subscriber is on the line and is temporarily unavailable.
Photon Telecoms Ltd
Photon Telecommunication Limited is a leading International provider of Telecom services, including carrier-to-carrier, carrier pre-selection, VoIP and pre-paid calling cards. With interests in Asia, America, Africa and Europe, our London-based company is
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