Hello there

We hear, if providers embrace VoIP it cannot earn as much as it could
do from traditional telephony. However, it is time to realize that
voice and data networks are merging and it is the same providers who
are gaining the chances to serve both the voice and data world. Thus
as whole it can be predicted that VoIP revenue will supersede PSTN or
any other traditional provider's revenue.

For more please have a look at my blog in this link:
http://jubaerarif.blogspot.com/2007/01/pstns-fear-of-losing-revenue-to-voip.html

or

http://www.jubaerarif.blogspot.com/

With regards
Arif.