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TinyTunerz
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Joined: Jan 15, 2008
Posts: 4

PostPosted: Mon Jan 14, 2008 8:19 pm    Post subject: Voice Quality Degradation - Intermittent Voice Interruptions Reply with quote Back to top


I have been troubleshooting an intermittent voice interruption issue that I cannot seem to solve. Below are the details:

When talking to someone on the phone, the person on the other end experiences what they describe as me pressing the mute button several times while I am talking to them.

Location: Eastern Pennsylvania
DSL Service through Frontier Telephone (Formerly Epix)
Downloads speeds consistently around 1.2MB - 1.3MB.
Upload speeds consistently around 320KB.
DSL Modem: Seimens Speedstream 6520
Vonage Adapter: DLink VTA-VR
Network Connection: DSL Modem --> VTA-VR
Cordless Phone: Uniden DECT6.0 Cordless Phones

Recipient experiencing choppy or muted calls (In other words, when others talk to me, they experience the choppyness. I hear them perfectly fine.

Troubleshooting Done So Far:
Obviously...rebooted and reset the modem and Vonage adpter several times to no avail.
Connected a stardard LAN line phone to the Vonage Adapter to remove the cordless phone from the equation.
Swapped out my standard 6520 Modem with a Seimens SE567 modem to no avail. (Swapped modem back to 6520 modem)
Created a DMZ on the DSL modem for the Vonage adapter.

Voip TEST RESULTS:
Speed test statistics
---------------------
Download speed: 1242104 bps
Upload speed: 328640 bps
Quality of service: 84 %
Download test type: socket
Upload test type: socket
Maximum download pause: 266 ms
Average download pause: 26 ms
Minimum round trip time to server: 44 ms
Average round trip time to server: 158 ms

Voip test statistics
--------------------
Jitter: you --> server: 6.9 ms
Jitter: server --> you: 9.4 ms
Packet loss: you --> server: 1.0 %
Packet loss: server --> you: 0.0 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Number of supported Voip lines: 5
Estimated MOS score: 3.6

_________________
Regards,

Tiny-Tunerz
----------------------------------------------------------------------------------------------
Profile:
- Frontier Telephone DSL 1.5MBps Download/Upload 384KBps
- Siemens ADSL Modem 6520
- Vonage VTA-VR Telephone
- DLink DI-6
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Steve48
Vonage Forum MVM
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Joined: Aug 30, 2005
Posts: 4777

PostPosted: Tue Jan 15, 2008 7:48 pm    Post subject: Reply with quote Back to top

I'd say you definitely have an ISP issue to look into. Your max pause and average turnaround times are too high.

Tell us more about your network. The VTA needs a router, but you don't seem to have one. Is the modem also a router?

_________________
Steve Gray
Orlando, FL
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brian188
Vonage Forum Master
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Joined: Mar 04, 2006
Posts: 203

PostPosted: Wed Jan 16, 2008 2:42 am    Post subject: Reply with quote Back to top

Steve is right on, I would also ask if when the remote caller complains about this issue are you doing anything else with your internet connection?

Your symptoms are indicative of problems on the upload (sending) since you hear no problems. As you probably already know your uploads speeds are not the best. You may want to try the bandwidth saver on the Vonage CP.

When set to the Highest setting you are using the G711ulaw Codec. This codec only converts audio to data and does not compress it. This allows for the best voice quality (if you have the necessary bandwidth) and it consumes 90kbps throughout your call.

Lowering the bandwidth saver setting changes the codec you are using and adds compression thereby lowering voice quality (but if you don't have the necessary bandwidth it would be an improvement over choppy calls). For example using the G.729 Codec will only consume about 32 Kbps vs 90.

As Steve said however the issue could also lie in your router/modem.
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TinyTunerz
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Joined: Jan 15, 2008
Posts: 4

PostPosted: Thu Jan 17, 2008 12:52 pm    Post subject: Reply with quote Back to top

Steve48/Brian188,

Thank you for everyone's input so far. I'll check with my ISP regarding your comments. Also, My DSL modem is a Seimens Speedstream 6520; which is a modem/router.

All the default settings are in place on the 6520 modem/router with the exception of the PPPOE username and password settings.

I have my Vonage Bandwidth Saver settings set as follows: 50Kbps.

During the voice degradation/quality issue I am not doing anything on my computer(s) that is utilizing network bandwidth.

I agree the problem seems to be either my routers setting or most likely an ISP issue.

Any further feedback is requested and welcome. Let me know if there is any other information needed.

By the way...I've made no changes to my systems since I posted the original message, however the problem seems to have gone away for now. I'll run another Voip test tonight when I get home from work and post the results.
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TinyTunerz
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Joined: Jan 15, 2008
Posts: 4

PostPosted: Thu Jan 17, 2008 9:50 pm    Post subject: Reply with quote Back to top

When I got home I made a phone call and the person on the other line said I was breaking up intermittently. So I ran the Voip test again..

Here are tonight's speed test results:


Speed test statistics
---------------------
Download speed: 1296992 bps
Upload speed: 328640 bps
Quality of service: 96 %
Download test type: socket
Upload test type: socket
Maximum download pause: 204 ms
Average download pause: 25 ms
Minimum round trip time to server: 45 ms
Average round trip time to server: 180 ms

Voip test statistics
--------------------
Jitter: you --> server: 6.1 ms
Jitter: server --> you: 9.1 ms
Packet loss: you --> server: 0.0 %
Packet loss: server --> you: 0.0 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Number of supported Voip lines: 5
Estimated MOS score: 3.9


Any ideas?
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NHTracker
Vonage Forum Senior
Vonage Forum Senior


Joined: Mar 23, 2005
Posts: 134

PostPosted: Thu Jan 17, 2008 10:15 pm    Post subject: Reply with quote Back to top

brian188 wrote:
Steve is right on, I would also ask if when the remote caller complains about this issue are you doing anything else with your internet connection?

Your symptoms are indicative of problems on the upload (sending) since you hear no problems. As you probably already know your uploads speeds are not the best. You may want to try the bandwidth saver on the Vonage CP.

When set to the Highest setting you are using the G711ulaw Codec. This codec only converts audio to data and does not compress it. This allows for the best voice quality (if you have the necessary bandwidth) and it consumes 90kbps throughout your call.

Lowering the bandwidth saver setting changes the codec you are using and adds compression thereby lowering voice quality (but if you don't have the necessary bandwidth it would be an improvement over choppy calls). For example using the G.729 Codec will only consume about 32 Kbps vs 90.

As Steve said however the issue could also lie in your router/modem.


Huh? I consider his upload speed to be average. After Comcast's speedboost winds down I'm pretty much left with the same speed he has, albeit, my quality is better.
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brian188
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Joined: Mar 04, 2006
Posts: 203

PostPosted: Thu Jan 17, 2008 11:22 pm    Post subject: Reply with quote Back to top

NHTracker wrote:

Huh? I consider his upload speed to be average. After Comcast's speedboost winds down I'm pretty much left with the same speed he has, albeit, my quality is better.


Well, considering his upload of 328000 bps is about a third of a meg. and as I said a call uses 90 Kbps (or ~90000 bps) on the high bandwidth setting that is more than a quarter of the available bandwidth. It wouldn't be hard to use the rest and degrade call quality.
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brian188
Vonage Forum Master
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Joined: Mar 04, 2006
Posts: 203

PostPosted: Thu Jan 17, 2008 11:26 pm    Post subject: Reply with quote Back to top

And back on point, the Max pause is too high on both tests. While the average pause doesn't seem to bad. Is your router/modem leased from your ISP? If so, I would have them change it out. Usually (but not always) if you take it to them they will swap it for no charge. I'd try that first, if it doesn't help you may need to try tweaking some settings in the router.
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TinyTunerz
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Joined: Jan 15, 2008
Posts: 4

PostPosted: Sat Jan 19, 2008 12:31 pm    Post subject: Reply with quote Back to top

As stated in my original message...I have a spare modem/router (SE567) that I hooked up and experienced the same results.
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