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Vonage I just wrote this novel over on a different thread:
The beeps are partially
I just wrote this novel over on a different thread:
The beeps are partially a function of the phone as well as the Vonage adapter. If you're using a cheap phone - ditch it. Get a quality phone, whether it be cordless or hardwired (or both).. I have the Uniden TRU8xxx series phones and love them, and also have a bunch of Nortel/Aastra phones as well. The Unidens are about as good as it gets for cordless, the Nortel/Aastra phones have amazing sound quality. I can't think of the last time I've heard a spurrious DTMF tone with these.
Without getting into a heavy discussion of telephone technology, you'll notice that your telephone wire only has 2 wires in it... but this presents a problem, as you're trying to carry 1) power, 2) sound to your phone, 3) sound away from your phone. Usually each one of these would require 2 wires, thus 6 wires for a phone. Back when all phone lines came from the phone company, running 6 copper wires for every customer vs. 2 wires is an expensive proposition, so they worked to reduce the # of wires per customer. Combining power and one of the audio paths isn't that difficult, but that still leaves us with 4. (If you think about it, the speakers on your stereo/computer/etc always have two wires, positive & negative. The same applies to microphones) The trick is in combining the 4-wire audio down to 2 wire. Oversimplifying things, if you were to connect your sound source (say, a microphone) to your output, you get feedback, which isn't something anyone wants to hear. So, the telephone companies have devices called hybrids, which convert between the 4-wire & 2-wire systems. Your telephone also has simpler circuitry which performs the same task of splitting the audio to the earpiece & microphone. Your Vonage adapter also has a hybrid in it, which combines & splits the audio from the digital decoder, your telephone, and the digital encoder.
The Vonage adapter DOES play a role in this, and we've seen how much of a difference the hardware makes, especially if you look at the older firmware versions for the RTP300 which were echo-prone, but this has been fixed for awhile. So, your telephone DOES play a role in the call quality.
For those even remotely interested in this, I'd highly suggest reading Steve Church's telephone guide over at:
http://www.telos-systems.com/techtalk/3-10.pdf
While the document is written for broadcast engineers, I think most people could read through it and still learn quite a bit from it. The document gets into all of the nitty gritty about the phone system, "standards" (mainly lack thereof), signalling, PBXs, etc. Voip isn't specifically mentioned in there, but most of this still applies to Voip, especially when using regular telephones or calling POTS lines with Voip.
Read The Full Thread: Getting the sound as if someone is pushing a number key
• Hi all -
I've recently been getting this wired problem:
In the middle of a conversation
• Vonage has to emulate the DTMF tones you would normally get passed straight over
• I’m just curious, why is it that Vonage has to emulate the DTMF tones rather then
• Because everything is converted from an analog signal to digital so it can be sent
• Interesting, because it mostly happens with calls to my mother-in-law...
• Yes, it usually happens for me (on the rare occasions it happens any more) when
• I had it happen when talking to my Mom last night. After I read this post, I called
• it happens more often with women or those with lighter voices because they are
VonageTPA posted "I just wrote this novel over on a different thread:
The beeps are partially" on 03/05/2006 |
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