Vonage Holdings confirmed Monday that it has complained to the Federal Communications Commission about "an instance of portblocking of our service," according to a company spokesperson.

After initially saying Monday morning that it would not comment on the report of its complaint, Vonage vice president for corporate communications Brooke Schulz sent an email Monday evening with the following response:

"We met with the FCC to discuss an instance of portblocking of our service by a high-speed Internet provider. We sought the FCC's counsel on how to proceed with this issue. There has been no formal complaint filed, nor have we had any subsequent discussions with the FCC regarding the details as we understand they plan to look into the matter."

The incident, Schulz said, involved multiple Vonage customers whose service was being affected by a single provider. Schulz said Vonage would not comment on what type of broadband provider the company was complaining about. In an interview Monday, FCC chairman Michael Powell said he was under the impression that the incident involved a rural LEC.

Schulz went on to say that Vonage is still "waiting for direction" from the FCC regarding the incident, but that Vonage CEO Jeffrey Citron was not available to comment further.