How does DLS Hosted PBX work?

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DLS Hosted PBX Service is based on Voice over Internet Protocol (VoIP), a method by which voice is digitized and transmitted in digital packets rather than using traditional circuit-committed protocols of the public switched telephone network (PSTN). Every VoIP telephone has a unique IP Address. Thus Hosted PBX service translates the public phone network call to an IP address. When a call is received by DLS, the Hosted PBX switch looks up the handset’s IP address and delivers the call to it.
Probably the most significant difference with VoIP, as compared to PSTN, is that telephone lines are not assigned in a dedicated, predictable manner to support a voice call. Instead, line bandwidth for a VoIP telephone conversation is allocated on as needed basis, via packet switching.

Advanced VoIP telephony includes many enhanced features, such as voice mail, conferencing, presentation viewing, and unified messaging for cell and PDA devices. These service applications reside on hosted network servers, which deliver very fast response and provide all the features of Hosted PBX.