Originally Posted by asian_XL
Probably an old Vonage adapter or an adapter from one of the other VoIP providers.
I used Vonage for about a year. It was alright for the price, but since I was using it for business, the echo and the occasional dropping of audio was unacceptable so I cancelled it when the contract was up. I'm not sure if OP is using something like Vonage, but there was a big debacle a few years ago about Shaw throttling Vonage's VoIP service in an effort to promote their phone service. (i.e. essentially make Vonage look bad)