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.
LinkNet Telecom
A-Z Termination, A-Z Termination, Cloud-based Unified Communications Service Provider, did numbers provider, FREE Callshop Software, Hardware, Hosted PBX Service Provider, Hosted VoIP billing service provider, Incumbent PTT, International VoIP Wholesale P
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