& cplSiteName &
Comments
Newest First  |  Oldest First  |  Threaded View        ADD A COMMENT
Page 1 / 2   >   >>
OldPOTS
OldPOTS
12/5/2012 | 4:07:56 AM
re: Report Hisses at VOIP Quality
Well there are solutions for the voice quality problem, like QoS, but that cost big $$$.
So will there be improvements? Or will the business case with low margins be to serve only those people that will accept the lower quality?

But at what price?????

OldPOTS
stephencooke
stephencooke
12/5/2012 | 4:07:56 AM
re: Report Hisses at VOIP Quality
Hi,

This was in the Globe & Mail today:

http://www.theglobeandmail.com...
unlimited
unlimited
12/5/2012 | 4:07:55 AM
re: Report Hisses at VOIP Quality
The obsession with VoIP telephony seems misguided to me. VoIP over the Internet (general purpose data network) cannot match performance of the purpose built PSTN. Not in the near future anyway. But it seems like the wrong approach for VoIP. VoIP should be used for applications that are not suited to the PSTN. In theory, if you build voice applications that don't easily compare to telephony, there is a chance to re-invent voice communications in a less threatening environment.

If history is anything to go by, making the most of new technology is usually most successful when its unique properties are exploited, not when it is used to incrementally improve an existing product or service.

Often when you try to apply new technology to an existing problem it appears to need a lot of investment to make it good enough to replace the prior technology.
netsalesman
netsalesman
12/5/2012 | 4:07:54 AM
re: Report Hisses at VOIP Quality
Liked the article a lot. Just a thing about sound quality: how come that skype quality is so high (much higher than POTS or PSTN which is indeed quite poor being just limited to a 8Khz spectrum) ? Why don't provider use the same codec as skype?


netsalesman
netsalesman
12/5/2012 | 4:07:53 AM
re: Report Hisses at VOIP Quality
Stephen,
thank you for replying but i think there's been a misunderstanding. I wasn't asking why incumbents or traditional SP do not use skype codec. This is something I know and that has to do with their legacy network in place for years now. I'm talking about the new VOIP providers. It reads in the article that among ten or so just a couple have an acceptable sound quality. So why don't they all switch to a skype-like codec? Sound quality issues would be minimized (at least).
stephencooke
stephencooke
12/5/2012 | 4:07:53 AM
re: Report Hisses at VOIP Quality
netsalesman,

"Why don't provider use the same codec as skype?"

Long story, but suffice it to say that it has been standardized worldwide for decades and it is in every digital piece of access gear. It was designed back in the 1970's. Back then, 64kb/s was more than enough bandwidth to compete with 'scratchy' analogue equivalents. In today's CD quality expectations it falls short of the mark.

Steve.
alchemy
alchemy
12/5/2012 | 4:07:52 AM
re: Report Hisses at VOIP Quality
netsalesman writes:
Liked the article a lot. Just a thing about sound quality: how come that skype quality is so high (much higher than POTS or PSTN which is indeed quite poor being just limited to a 8Khz spectrum) ? Why don't provider use the same codec as skype?

I thought Skype used the Global IP Sound iLBC codec? I have collected quite a bit of codec bake-off information including audio files fed through a half-dozen of the most popular compression codes. To my ear, iLBC is the worst codec. It's terrible reproducing things like music on hold and it does a poor job reproducing higher frequency female voice. Vanilla G.711 is superior to all the compression codecs. Of the compression codecs, I think G.729e does the best job with speech but even it sounds lousy with a typical music on hold.

For any audio testing I've ever done with "toll quality" codecs, the quality of the speaker and microphone on each end of the phone call ends up being far more important than the codec used.

Wideband codecs are useless at the moment since 99% of calls end up at the PSTN where you're stuck with the 3.1 khz limitations of G.711.
spelurker
spelurker
12/5/2012 | 4:07:51 AM
re: Report Hisses at VOIP Quality
> how come that skype quality is so high (much higher than POTS
> or PSTN which is indeed quite poor being just limited to a 8Khz
> spectrum) ? Why don't provider use the same codec as skype?

I have not found Skype's quality to be all that high, even when compared to POTS. But I doubt the codec plays a big role in either skype or anyone else's day-to-day quality. I blame the fact that the VoIP apps and the networks don't play well together. And, as alchemy points out, microphone quality plays a big role too.

I agree with (unlimited?) that VoIP is at a disadvantage without a decent market differentiator. Price seems to be the only one so far. I'm not well tuned-in to the enterprise market anymore, but I could see VoIP being a big deal there, since the converged network will give lots of $$$ savings. (plus email accessible voicemail & other fun toys)
mrbhagav
mrbhagav
12/5/2012 | 4:07:51 AM
re: Report Hisses at VOIP Quality

Check out NodeLogic, NetLogic and their competitors. There is renewed interest in Layer 7 control of IP streams to enhance QoS of VoIP and converged services.

I would be interested in understanding what this forum thinks about the technical and commercial potential of specialized VoIP/IPTV technologies.

Mark Sullivan
Mark Sullivan
12/5/2012 | 4:07:46 AM
re: Report Hisses at VOIP Quality
The codec isn't the problem with Skype. It's the worst and most annoying problem of all -- delay. Correct me if I'm wrong, but this problem still plagues Skype service. It's a problem with cell phone service too, but is ignored because of the convenience factor.
Page 1 / 2   >   >>


Featured Video
Upcoming Live Events
October 22, 2019, Los Angeles, CA
November 5, 2019, London, England
November 7, 2019, London, UK
November 14, 2019, Maritim Hotel, Berlin
December 3-5, 2019, Vienna, Austria
December 3, 2019, New York, New York
March 16-18, 2020, Embassy Suites, Denver, Colorado
May 18-20, 2020, Irving Convention Center, Dallas, TX
All Upcoming Live Events
Partner Perspectives - content from our sponsors
Sports Venues: Where 5G Brings a Truly Immersive Experience
By Peter Linder, 5G Evangelist, North America, Ericsson
Multiband Microwave Provides High Capacity & High Reliability for 5G Transport
By Don Frey, Principal Analyst, Transport & Routing, Ovum
All Partner Perspectives