Voip.org.pk - A resource on VOIP and its applications

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Welcome to the voip.org.pk Asterisk Pakistan Home

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For more than a century, the public switched telephone network (PSTN) has used circuit switching whereby, for each telephone call made, circuits are switched in the intervening telephone exchanges to create a physical connection between the caller and the person being called for the duration of the call. The great advantage of this type of switching is that call quality is extremely high because a dedicated line is being devoted to the call. The major disadvantage is that this type of switching is expensive because it requires considerable capacity in the network as most of the time most of the capacity is not being used.
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