HAMILTON - Source Cable Ltd. announced yesterday that it will launch voice over Internet protocol telephony in September. “We are extremely happy to announce the addition of Digital Telephone to our product line that includes cable, digital cable, HDTV, High Speed Internet and wireless Internet services,” said Dan Campbell, president of Source Cable, in a release. Source serves about 18,000 customers in and around southwest Hamilton. Campbell pointed out that in addition to offering a low cost alternative to the existing telephone provider; Source’s Digital Telephone service is portable, which will allow customers to take it with them when they...