Poor audio quality for the people I am calling.

Posts: 4 · New Forum Member Joined: Jul 23, 2005 Posts: 4

I have been a Vonage customer for 4 months now. The first three where great. The last week has been TERRIBLE. The audio quality one the other end, or the person I am calling is garbled and is very hard to understand. I have called tech support and was told that my cable modem (Scientific Atlantic modem dpx 2100) was too old and could not handle the codec. Why did it work for 90 days with no problem, and now is so bad? I will have to go back to a land line. My speed test came back a 1647kbs down and 378 up, this should be enough speed to handle the Voip. Any help or suggestions would be great

Posts: 646 · Posted: Sat Jul 23, 2005 2:01 pm Post subject:

Connection speed doesn't really matter much. Latency and jitter are the real factors in determining Voip quality.

You can test your internet connection at www.testyourvoip.com .

Not sure why it would have broken all of a sudden though... is your modem leased, or do you own it?

Posts: 4 · New Forum Member Joined: Jul 23, 2005 Posts: 4

Thanks for the quick response. I currently lease the modem. I called comcast, they told me this was the newer of the 2 they are using these days. Do you really think a different modem would make a difference?

Posts: 646 · Posted: Sat Jul 23, 2005 2:22 pm Post subject:

That modem looks ok, on paper at least... there's a chance it might not work as well as some other modems in practice, but I dunno.

Run a call to Boston on www.testyourvoip.com , view the detailed results, and post them here. There might be something useful we can gather from that info.

Also, see if your modem has a status page at http://192.168.100.1/ . Post your signal levels if you can find them there.

Posts: 4 · New Forum Member Joined: Jul 23, 2005 Posts: 4

I don't know how much information you need from the speed test.
One thing I am finding out as time goes by, the audio quality is worse during the afternoon than at night. I will try to run this test again when the sound is bad.
MOS
4.2 / 5.0
(Best with G.711 is 4.4)

Degradation Sources
Codec 0.57 70.7%
Latency 0.00 0.0%
Packet Discards 0.17 20.8%
Packet Loss 0.07 8.4%
Codec G.711 (PCM at 64kbps,
20ms RTP payload,
80kbps IP BW)
Round-Trip
Latency 114 ms
Packet Discards 0.7%
Packet Loss 0.3%
Loss Periods
Min: 20 ms
Avg: 20 ms
Max: 20 ms
Random Loss
Jitter
Min: 0 ms
Avg: 6 ms
Max: 29 ms
Signaling Quality
Post-Dial Delay 62 ms
Call Setup Time 93 ms
Media Delay 203 ms

MOS Analysis FROM Boston To You
MOS analysis chart
Media Quality
MOS
4.4 / 5.0
(Best with G.711 is 4.4)

Degradation Sources
Codec 0.57 96.8%
Latency 0.00 0.0%
Packet Discards 0.02 3.2%
Packet Loss 0.00 0.0%
Codec G.711 (PCM at 64kbps,
20ms RTP payload,
80kbps IP BW)
Round-Trip
Latency 114 ms
Packet Discards 0.1%
Packet Loss 0.0%
Loss Periods
Min: 20 ms
Avg: 20 ms
Max: 20 ms
Random Loss
Jitter
Min: 4 ms
Avg: 6 ms
Max: 27 ms
Signaling Quality
Post-Pickup Delay 113 ms
Call Setup Time 129 ms
Media Delay 148 ms

Posts: 4 · New Forum Member Joined: Jul 23, 2005 Posts: 4

I did try to access the modem using the ip you gave me, the only problem is I have no idea what the user name and password is.

Posts: 646 · Posted: Sat Jul 23, 2005 10:59 pm Post subject:

Your test results look pretty good, so I doubt the problem is related to your connection. Have you tried a hard-reset on the Vonage box?:

- unplug Vonage box
- hold down reset button
- plug it back in
- wait 20 seconds
- release reset button