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VoIp Usability 

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PSTN (Public Switched Telehone Networkl)
This could be a solution for a company that want to make internal calls using VoIp and provides a Gateway to the PSTN for a transapent use of the PC terminals or ip telephones like 'normal' telephones.

 

The type of the used network has a strong influence on the speech Quality. Each component causes its own deteriation of the speach quality