The
Internet Protocol (IP) is used to deliver packets carrying digitized voice.
However, IP was not designed for real time traffic such as voice and video
communication. IP is a connectionless protocol meaning a virtual connection is
not established through a network prior to transmission. IP makes no guarantees
concerning reliability, flow control, error detection or error correction.
Potential errors include out of sequence packets or even loss of packets. Voice
transmission requires guaranteed connection and a reasonable delay.
Nevertheless,
IP succeeds partly due to the high cost associated with the traditional circuit
switched TDM network. VoIP uses packet switched network. It makes the network
transparent to the upper layers that are involved in voice transmission through
an IP based network. The existing use of IP network also allows the integration
of voice and data integration. To leverage the connectionless nature of IP,
vendors have developed higher layer protocols to address the guaranteed
connection and transmission issue.
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