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Topic Title: ...because VoIP runs via the public Internet...
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Created On: 27 July 2011 03:51 PM
Status: Read Only
Related E&T article: VoIP: voicing security concerns
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 27 July 2011 03:51 PM
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martynd

Posts: 2
Joined: 31 May 2002

Not necessarily. Wholesale VoIP providers and enterprises will often have IP networks for voice that are completely separate from the Internet.
 23 September 2013 03:12 PM
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pwmchapman

Posts: 7
Joined: 09 February 2003

The article corrrectly points out that VoIP is charged at lower rates than tariffed TDM. However VoIP is not cheaper to implement, far from it. Uncompressed VoIP requires a bandwidth of around 100Kbps as opposed to the exact value of 64 Kbps for TDM voice. What is more, time slot interchange switching is far less expensive, and complicated than routers and the attendant protocols. The reason IP is believed to be cheaper is because the hardware equipment used is 30 years newer. TDM, built on today's hardware, would be cheaper than IP. As we used tosay in the TDM business, they have spent 30 years trying to make IP as good as TDM. I worked on a TDM Internet which would be far superior to today's Internet in terms of security and real time performance, but that's another story.

The bottom line is that IP is a poor technology for just about everything, including voice, for which it was never designed. It is only attractive because if is not tariffed, not because it is cheaper to implement. IP took off because it forced the network to be a store and forward network, which no-one realized at the time, was the key to communicaiton between disconnected end points, which is what was needed for an Internet.

Using technology to work around tariffing seems the wrong thing to do to me.
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