CORRECTED: Hackers can divert Vonage calls: security firm

(Corrects company's name to Vonage from Voyage in story)

BOSTON (Reuters) - Internet phone service from Vonage Holdings Corp is vulnerable to attacks by hackers, who are able to intercept calls to the company's subscribers, a security firm said on Wednesday.

Sipera Systems of Richardson, Texas, said it had informed Vonage of the problem more than a month ago, but the company had not responded to the warning.

Vonage spokesman Charles Sahner declined comment.