[FrankPetrilli]

> For VoIP, Amplitude distortion and quantization error (from multiple sources) means you will never get 56k over any voip system

https://frank.petril.li/posts/dialup-adventures-1/

I've done V.90 over VoIP. In a very controlled environment that was tuned for it, but VoIP nonetheless. The main issue is that VoIP timing, even with deep buffers, is prone to more jitter than a PDH network and the phase drift will eventually cause enough errors to force a retrain every few minutes. Either way, "never" is a little too absolute IMHO. :)

[epcoa]

Fair enough. How about V.92? Have you had a setup where upstream PCM could be successfully established?

[FrankPetrilli]

Good question - it's been almost two years since this project so I don't recall whether V.92 came up at all, even on a pure T-1 setup. I still have all the gear, if I set it up and run it again I'll update this thread.

[simfree]

What gear were you using?

[FrankPetrilli]

https://frank.petril.li/posts/dialup-adventures-1/ explains it all!

[simfree]

Any chance you would be bringing that modem bank to ToorCamp on Orcas Island? The ShadyTel network could always use a better, faster dialup ISP!