----- Original Message ----- > Yes I realize the more people that are listening or watching. > This is why I was looking for a VPN program.
Something you need to consider, VoIP uses UDP because it is better to have a drop out during live voice calls than to introduce further latency waiting for a retransmission to make it to you. VPN uses TCP because it is a layer that does not know what it is transporting and therefore needs to make sure all the bits make it from one side to the other. So UDP within TCP doesn't help you on the quality front. In fact, it is likely going to make things worse as you will introduce jitter. Jitter is the term used for the differing times it takes for packets to arrive. Higher jitter means the phone has to add delay to the fast packets to keep a smooth flow for the slow packets. If in the VPN world, you have a retransmission to get the VPN packet through that happens to contain a VoIP UDP packet, you introduced jitter that wouldn't have been there without it. I know there was discussion of doing encryption within the VoIP stream, as then you could eliminate the overhead of VPN and the increased config overhead. The trouble with the VoIP encryption that I remember was how do you encrypt each packet going out such that the loss of a packet doesn't cause the decryption to fail. You may want to look at this article for more info about encypted VoIP. http://www.voip-info.org/wiki/view/Asterisk+encryption -- Steven Critchfield [email protected] -- You received this message because you are subscribed to the Google Groups "NLUG" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nlug-talk?hl=en
