In the three months ended June 30, the number of North American VoIP users subscribing via their broadband cable Internet service provider leaped from some 911,000 at the end of March to 1,381,407.
"The cable VoIP pace will likely accelerate further in the second half of (this) year as such major (cable system operators) as Comcast, Charter and Rogers gear up more," write Cable Digital News analysts Alan Breznick and Michael Harris.
Here are CDN's estimates for cable-delivered VoIP subscribers by company as of June 30, 2005, as well as each provider's subscriber growth in the three month period ending on that date (my links are to the home page for each broadband provider's VoIP service)
Time Warner Cable- 614,000 subscribers, for a net gain of 242,000;
Cablevision- 476,357 subscribers, for a net gain of 113,877;
Cox Communications- 90,000 subscribers, for a net gain of 30,000;
Charter Communications- 67,800 subscribers, for a net gain of 12,500;
Videotron- 41,800 subscribers, for a net gain of 26,900;
Comcast- 37,000 subscribers, for a net gain of 15,000;
Shaw Communications- 22,450 subscribers, for a net gain of 18,938.
Kinetic Strategies estimates that all other North American cable systems had a combined 30,000 subscribers on June 30, a net gain of 11,000 subs from March 31 of this year.