I don't know where to place this

[Ranjha]

"Try switching to port 1720, the standard VoIP port. It works with Rogers Cable in Canada. They don't run packet shapers on any traffic on that port, for fear of lagging VoIP calls."

I found this On one of the forums and i don't know where to place this 1720 ??.. I am using ROGERS CABLE and i live in canada, hopefully this works for me .. but i need help on where to place this 1720.. either in TCP Port or the UDP Port