1 edit | reply to Onebucket
Re: HD Voip? This gets discussed quite regularly on the VOIP Users Conference and the discussion always centers around a couple of problems:
1. Broadband connections are not as common as you might think. Wideband calls (HDVoice, G.722, or whatever marketing term you want to use) require more bandwidth and higher quality connections than standard PSTN quality (G.711) calls.
2. Most VOIP users are using ATAs and cordless phones for making calls. ATAs by definition convert analog signals to a digital connection. So PSTN quality is the best you will get with an ATA. The same is true for the cordless phones which typically have lower quality transducers and speakers negating the higher quality of wideband calls.
3. Because calls placed over the PSTN get converted to G.711 (narrowband) you would need to bypass the PSTN and maintain a 100% IP based call (either SIP, SCCP, Skype, or other protocol) to keep it wideband. SIP URI calling allows this but most phones lack a keyboard so dialing the SIP URI is a PITA.
4. Most people are currently happy with cellphone quality and probably don't care enough to make adoption financially feasible.
So until we solve these issues, HD Voice/wideband calling is only going to be limited to the techies of the world (or corporations that have expensive phone systems that can handle the hand-off transparently). |
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| said by dcdeadbeat5:1. Broadband connections are not as common as you might think. Wideband calls (HDVoice, G.722, or whatever marketing term you want to use) require more bandwidth and higher quality connections than standard PSTN quality (G.711) calls. The bandwidth requirements for G.711 and G.722 are exactly the same. The G.711 codec has an 8-kHz sampling rate, and any signal above 3.44 kHz is blocked. With G.722 wideband codec, the sampling rate is increased to 16 kHz, doubling the frequency range to 8 kHz. The end result is still 64kbps. |
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| Yes but you are assuming that most people can even use G.711. There are many people in the United States with less than 1Mbps connections or poor quality (high latency) connections that are going to be limited to G.729a.
For example my mother's AT&T DSL will not handle G.711 and must use G.729a due to high packet loss.
Remember that bandwidth issues are not necessarily about the speed of your connection but how few packets are dropped. That's why T1s are still popular in businesses as they are relatively low latency and high quality. |
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| reply to dcdeadbeat5
I am assuming that this would be limited to voip-voip connections for a long time, but if enough people get on the voip bandwagon, and enough of them want sound that is better than pstn, it might spur handset manufacturers to come up with better-sounding ones than exist now, as well as convince other manufacturers of the voip 'infrastructure' to come up with equipment that would pass along the good sound.
Maybe people, even voip users, are so used to pstn-type sound that they aren't interested in this, but speaking just for myself, I can tell you that talking to relatives over skype, with a headset, is a whole new ballgame compared to calling them via pstn or voip-landline. It really makes the phone call more valuable to me. |
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| I agree. On the VOIP Users Conference call, many of the regulars connect by way of a HD/wideband bridge because we all can't stand the narrowband PSTN bridge of the conference call.
In case anyone is interested in joining our weekly discussion about VOIP (it's a bit heavy on Asterisk but all VOIP users are welcome), info can be found at »www.voipusersconference.org/about/ . It's free of course. |
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| reply to Onebucket
Most people seem to get on VOIP without realizing it. Uverse, Comcast digital voice, Vonage, even Ooma are all venues to get VOIP, but my guess is many who use these services don't understand what VOIP is or that they are using it.
The question is will AT&T, Comcast or Vonage see it as in their interest to offer higher quality voice service. If they do, then we may see some interest. I doubt mom and pop VOIP providers can successfully push higher quality voice for the masses.
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"People demand freedom of speech as a compensation for the freedom of thought which they seldom use." |
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