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PostPosted: Sat Feb 03, 2007 2:11 pm    Post subject: choppy incoming audio. USB modem. Reply with quote Back to top


Just took our Vonage box and vphone down to Argentina and I desperately need to hook it up for work!!

The problem is that the ISP here has provided me with a DSL/USB modem which works fine for getting the computer here online. Unfortunately it does not allow me to hook up my Vonage phone (which works with ethernet only).

As an alternative I have a V-phone USB stick which I plugged into the other USB slot on the computer. I´ve made multiple calls all of which have reported back that the outgoing audio is spectacular (ie:they hear me crystal clear), but the incoming is rubbish (I can´t hear them at all)! It is consistently choppy as if the incoming data is bottlenecking somewhere.

I have disabled the firewall and virus software on the computer. This has not helped.

Does anybody have any ideas? Here is the data I pulled off of which I do not understand at all.

Any ideas at all would be SO appreciated. Thank you very much


Media Quality MOS 4.1 / 5.0
(Best with G.729 is 4.2)

Degradation Sources
Codec 0.83 90.6%
Latency 0.09 9.3%
Packet Discards 0.00 0.0%
Packet Loss 0.00 0.0%

Codec G.729 (CS-ACELP at 8kbps,
10ms RTP payload,
40kbps IP BW)
Latency 296 ms
Packet Discards 0.0%
Packet Loss 0.0%
Loss Periods Min: 0 ms
Avg: 0 ms
Max: 0 ms
No Loss

Jitter Min: 0 ms
Avg: 5 ms
Max: 15 ms
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PostPosted: Sun Feb 11, 2007 6:24 am    Post subject: Re: choppy incoming audio. USB modem. Reply with quote Back to top

greig wrote:

The problem is that the ISP here has provided me with a DSL/USB modem which works fine for getting the computer here online. Unfortunately it does not allow me to hook up my Vonage phone (which works with ethernet only).

Part of the problem is that USB is a shared bus standard. That is, everyone on the USB bus shares the exact same bandwidth. USB 1.1 only supports up to 12Mb/s transfer rate, although USB 2.0 supports up to 480Mb/s. Still, if something on the bus is sending or receiving data, the other devices have to wait their turn.

This is obviously not exactly a good thing when it comes to your network connection and Vonage both using exactly the same USB bus at the exact same time. Both will be sending and receiving packets at the same time (as you want to use them at the same time), which could be causing some of your problems.

Unfortunately, contention issues such as this won't show up when you test your Voip via one of the online test sites, as these use software to simulate the audio input and output, and don't actually throw any audio data across the bus.

There are a few ways you can test to see if USB bus contention is a problem. One would be to get yourself a PCI USB 2.0 adapter card, with its own USB processing. Use onee of your V-Phone or modem from the built-in USB, and the other from the card, and see if this improves the situation. Or, if you have a second machine available, try it with the V-Phone on one machine and the modem on the other, with a network connection between the two (and proper routing in place), and see if that helps clear things up.

Your Voip test scores look pretty good. You could still be having routing difficulties or delays between yourself and Vonage, but my gut feeling is that you have USB bus contention issues that need to be addressed first.

(Of course, getting yourself a proper ethernet modem would be a good fix as well Smile ).

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