Voice-over-IP was developed to work over a network where bandwidth is unconstrained (as with wireline networks)... But bandwidth in wireless is always constrained,
issues like jitter and delay, \ "The human ear is very sensitive. [Even in voice transmitted] over satellite, if you have a quarter-second delay, you would notice it."
QoS handles congestions [issues] only, not changing of channels or latency or jitter," he said.
Wireless broadband equipment use frequency channels to transmit signals, and channels can be changed to prevent interference.
besides capacity and quality problems, voice over wireless also faces interoperability challenges.
To overcome this, voice over wireless will need a set of standards similar to those that have been set for VoIP over wireline networks, such as Session Initiation Protocol (SIP) and those ratified by the IETF (Internet Engineering Task Force)
Service providers, which are leading the adoption of WiMax and thinking of offering voice over wireless, should therefore focus on the business case, and not just the technology. "Offer services on a limited coverage [first]… Go through a progression
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