Likely, you are running into packet queue problems. As I recall, the vonage device goes on the line before anything else, so it can shape the stream to put it's bits first, ensuring it's packets get out in a timely matter ( #1 important thing in voip ). If you were to shape your stream and put your voip bits first, then I think you'd see an improvement in the qualty of service.
I agree I probably am having some packet queue problems, however i don't think it's my only problem. My Vonage ATA adapter is actually further behind the line than my Asterisk server. My configuration is such:
Cable Modem --> Asterisk Server & Linux Router (Each have their own real IP) --> Vonage ATA (behind Linux router)
I don't have QoS running on my Linux box, though I've been thinking about trying to implement it. If I did manage to get it implemented then I'll probably also move my Asterisk server behind the router. Up until now I've left the Asterisk server in the real world due to problems running Asterisk behind a NAT. Those problems, however, seem to have been dealt with and a friend of mine is successfully running his behind a NAT. So QoS may be the way to, perhaps.
I don't think it'll resolve all my issues though - if the Vonage ATA can do it withough QoS running, then surely there's more I can do with Asterisk. Perhaps the new jitter buffering coming soon will fix... *shrug*...
Paul
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