Nortel leading in terms of live VoIP subscribers served

There were estimated 69.2 million VoIP subscribers worldwide as of 1Q08. USA had the most subscribers (18.1m) followed by Japan (16.8m). France was at number three with 11.5m subscribers. Chart below gives VoIP subscriber numbers in top 10 countries.

Here is a surprise however: Nortel leads in terms of live VoIP subscribers served over a vendor platform. An estimated 10.8 million VoIP users are being hosted by Nortel platform. These are no doubt the North American cable customers. Outside North America, Nortel VoIP service provider customers include Neuf, UPC, etc. No vendor however beats the homegrown and open source VoIP platforms that now serve an estimated 12.3 million VoIP customers worldwide.