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Reply To: VoIP crackdown

VOIP Control

Lets go step by step, when you do VOIP the first thing you need is to asure the two way path for your voice traffic, even if you are behind NAT, second you need to make sure that you have enough bandwidth to complete calls with the amount of ports that you installed, if you are a wholesaler you may have 2 or 3 E1’s in the same location, this will require 1.5 to 2 Mbps of bandwidth and the behavior of that bandwidth is pretty much simetrical, Internet Service Providers that want to identify traffic will close some ports used by your gateway for billing and for gatekeeper authentication first like ports 1718, 1719 and 1720, then ports used by Radius AAA 1812 and 1813 and finally a little bit of monitoring of bandwith usage on the interfaces assigned to the customers using SNMP so you can verify the type of behavior of the customer’s traffic.
Doing so you take down probably a big group of ilegal VOIP carriers.