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Vonage I recently signed up for Vonage. In general, the audio quality is fine. However,
I recently signed up for Vonage. In general, the audio quality is fine. However, I've noticed one extremely annoying behavior that I believe is due to the echo cancellation built into my ATA (Linksys RT31P2). Shortly after (roughly 1/2 second) I speak, the incoming audio is briefly cut off. This means that if I happen to speak at about the same time as the person on the other end, I miss what they say. The problem is worse the louder I speak. As an extreme, if I whistle very loudly, the incoming audio cuts out entirely until I stop. The end result is that the incoming audio sounds choppy (or non-existent) whenever I talk. This is annoying enough that I can't live with it.
One reason I'm confident this is related to echo cancellation is that if I speak (or whistle) quietly enough, I can hear a faint echo (about ~500ms delayed - rough estimate). I'd much rather have the faint echo than no sound at all. Note that I've tried this on phone calls to several different people with several different TelCos and it has been quite consistent (so I doubt that it's, for example, a particularly bad far-end hybrid or handset causing excessive echo).
So first of all, the 500ms round-trip time is very surprising to me. I've run several broadband speed tests (including the vonage-forum one) and the results have all been great. RTT is usually around 100ms, packet loss almost alway 0, downstream 1.3Mbps and upstream 300kbps. Because of this, and the fact that my Vonage service is otherwise fine, I do not believe that this is a problem with my Internet connection. What is the normal end-to-end (including the PSTN) latency I should expect? Assuming the 100ms IP RTT time is accurate, I'm amazed the PSTN loop would add another ~400ms to that. Is there any golden-phone number or something I can call which will accurately measure the full end-to-end voice round-trip-time? Perhaps there is an underlying latency problem here which is causing the echo cancellation to malfunction.
Regardless of the delay, I'd be content if I could just prevent the audio from cutting out. I just got off the phone with Vonage tech support, and he wasn't aware of any way to disable the Linksys echo cancellation (and of course I'm locked out from all of the Voip configuration). Instead he said he'll try "lowering the packet size from 020 to 010", but it is not clear yet to me if this has had any affect on the problem (that can't be bytes, can it? 20 - or 32 if it was hex - bytes for a UDP frame is WAY to small to be efficient.).
Has anyone else experienced a similar problem? I'm considering switching to SpeakEasy Voip (my ISP - who claim their private network allows them to prioritize Voip traffic end-to-end to maintain very low latency).
Thanks
Rick
Read The Full Thread: Poor quality echo cancellation on Linksys RT31P2?
• I have the exact same problem. One difference is that I have the RT31P2. I have narrowed
• There is one item missing in your discourse. Who and where are you calling?
Echo
• It is not a normal echo. It is very hard to explain. It is like you hear a few of your
• I think my problem is different from yours jockey. I do experience it on all (or
• I've also experienced the echo. Echo is dealt with throughout the network. Vonage
• The 10 or 20 is referring to milliseconds per packet. At 8khz, 8-bit sampling,
• Thanks that does make sense.
but what is Vonage doing about the annoying echos
• I fixed this by changing to another VOIP provider. It is funny how Vonage kept telling
rbyers posted "I recently signed up for Vonage. In general, the audio quality is fine. However," on 03/06/2005 |
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