আইপি টেপিফ োনী
Packet Telephony Network Drivers
The architecture built for voice is not flexible
enough to carry data
Because the bearer channels (B channels and T1
circuits), call-control (SS7 and Q.931), and service
logic (applications) are tightly bound in one closed
platform, it is not possible to make minor changes
that might improve audio quality.
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Telecommunications Deregulation
Although deregulation and competition have existed
in the U.S. since 1982, their emergence in other
countries is more recent. China and Germany, for
example, have opened up their respective telephone
markets only within the last few years.
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Data/Voice/Video
The integration of D/V/V is more than just a
change in infrastructure. D/V/V integration also
enables new features to be developed more
quickly and opens up application development
to thousands of Independent Software Vendors
(ISVs).
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Circuit Switching Versus Packet
Switching
Standards-Based Packet Infrastructure Layer
This infrastructure most likely will be IP. IP is so
attractive as the packet infrastructure because of its
ubiquitous nature
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Communication : RTP/UDP/IP
Packet Loss: Transmission Control Protocol/Internet
Protocol (TCP/IP) was built to utilize packet loss as a
means of controlling the flow of packets. In TCP/IP,
if a packet is lost, it is retransmitted.
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Delay