wiggles4
join:2004-10-09
Eugene, OR
| Who uses what Codec? Is there a list out there with as many providers as possible and the codecs they use? To me this is the most important aspect since it determines both the quality of the call and how much bandwidth you need, yet I've been very unsuccessful in finding this information. Thanks for any help. | |
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 muppetmaster
join:2002-10-22
Barcelona | Re: Who uses what Codec? I have 4MBit down/750Kbit up and I use ULAW and G729 depending on which service I use. | |
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 | VTSherwood
join:2005-07-18
Columbus, OH
1 edit | Re: Who uses what Codec? ViaTalk (yes I'm an employee) uses:
G.711u (Ulaw Compression) | |
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| bruno6723
join:2005-07-21
switzerland
| said by muppetmaster  :I have 4MBit down/750Kbit up and I use ULAW and G729 depending on which service I use. :) | |
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Nate425
Premium
join:2005-02-03
Charlottesville, VA
clubs: | Re: Who uses what Codec? Wow, way to dig this one up  | |
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nsumner
join:2001-12-13
Israel
1 edit | I don't know of any such list but I see no reason we can't make one. I will try to keep this post updated with the information. Right now I can fill in the following.
Vonage: G.711/G.726/G.729
Broadvox Direct: G.711/G.729 + T.38
Packet8: G.729 (G.711 Fax)
AT&T Callvantage: G.711
Broadvoice: G.711
VoicePulse: G.711/G.726-32/G.726-16
Lingo: G729 + T.38
FWD: G711
Voiceline: ?
Iconnecthere: ?
Quantum Voice: G.711/G.729
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[Edited by request. --kc] | |
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| wiggles4
join:2004-10-09
Eugene, OR
| Re: Who uses what Codec? Thanks, nsumner. That actually clears up most of the companies I was unsure about. I thanks to the mods for sticking this. I was a bit disheartened when I saw it fall to the third page after half a day.  | |
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adisor19
join:2004-10-11 | Re: Who uses what Codec? ok, so where can we find info on wich codec offers the best voice quality ?
Thanks in advance,
Adi | |
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| magm58
join:2000-07-12
East Elmhurst, NY | nsumner for you info Broadvoice is using the codec G711u | |
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pcmeet
Official Dta Guru
join:2003-09-15
Montgomery, AL | Anyone know what codec sipphone.com uses ? I have the dialup sip phone DUV-1000 uses G.729 and want to see if it will work with sipphone. | |
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| lyulyok
Premium
join:2004-04-15
Seattle, WA
| iConnecthere:
After much experimenting with iConnectHere and Asterisk, I have found out the following:
g711 - US calls, good quality.
g729a/gsm - international, at least to Ukraine. Quality is pretty horrid there. Looking for the VOIP provider that will allow g711 internationally. | |
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dritchie
join:2001-05-07
Euclid, OH
| Just an FYI -
Vodavi in theirVoIP offerings use
G.711 @ 110kbps for "full" B/W connections and
G.723.1 @ 22kbps when B/W needs to be limited.
G.723.1 can sound almost toll quality when you have some control over QOS.
Do you understand the deference between
G.711u-law and G.711a-law? | |
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| | mskeven
join:2004-09-08
inida | Re: Who uses what Codec? Do you understand the deference between
G.711u-law and G.711a-law?
---------one is US standard
one is Europe standard | |
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| | hoffa3
join:2000-04-18
Las Vegas, NV | Is that Kilobytes per second or kilobits per second? My cable connection can only do about 512kilobit upload. | |
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| VoiceWingRep
Premium
join:2005-07-28 | Verizon VoiceWing has standardized on G.711. G.711a as default and G.711u when the connection allows. | |
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mchung55
join:2003-09-04
Lisle, IL
| Here are some example of voice quality MOS (Mean Opinion Score) scores collected before. G.711 has the best voice quality. However, you need to pay for the price of high bandwidth.
1. PSTN switch: MOS is closed to 4.5
2. G.711 A/M: 4.4 or up
3. G.729: About 4.0
4. G.723: About 3.5
5. G.726: If I remember correctly, depend on its rate, the score is between 3.5 to 4.3. | |
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nsumner
join:2001-12-13
Israel
| Hmm, I can't go edit my post to add Quantumvoice. I am also looking for confirmation on what Codec Broadvoice is using. I was told a while ago they switched from G.711u to G726-32, can anybody confirm what they are using (okay okay okay I shall send them an e-mail). | |
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digiblur
Got Sipura?
Premium
join:2002-06-03
Louisiana
| Nothing like the hearing the difference of G.711 I compared the quality of P8 and VP next to each other for a while and kept finding myself picking up the VP line instead of the P8 line. The main difference I found was I didn't find myself "stepping" on the other persons conversation. We didn't get the "go ahead" "go--" "you go ahead" type thing you hear from talking in between two different digital cell phone providers. | |
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| ieee1394
Premium
join:2001-08-25
Washington
 ·TowerStream
| Re: Who uses what Codec? said by digiblur : The main difference I found was I didn't find myself "stepping" on the other persons conversation. We didn't get the "go ahead" "go--" "you go ahead" type thing you hear from talking in between two different digital cell phone providers. It's odd that there hasn't been much discussion about this side effect that can sometimes occur. I think it's related to jitter. While either listener may be hearing great audio quality the fact of the matter is that if there is excessive jitter during the connection (usually caused by latency) then the audio will actually be "played back" (as it were) with enough timing difference that you will start stepping over each other's conversation without knowing it until both parties try to talk at more or less the same time.
The other problem that often comes up is that one person in a conversation is speaking and the other wants to interrupt. But for some reason or another it's like the other party doesn't hear the interrupting party at all. | |
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| | caseydoug
join:2001-08-14
Seattle, WA
| Re: Who uses what Codec? said by ieee1394 : The other problem that often comes up is that one person in a conversation is speaking and the other wants to interrupt. But for some reason or another it's like the other party doesn't hear the interrupting party at all. This can also be due to Voice Activation Detection ("VAD"), which is totally independent of Codec. This is a bandwidth-saving feature that suppresses transmission of the audio signal until it detects sound. It conserves bandwidth, but causes a slight delay in the transmission. | |
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daguy
@rr.com | mutualphone - g.729 | |
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Walla
join:2004-02-26
Israel | MSM Netphone uses 711 and 726 - soon to have 729! | |
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savoxis
join:2004-12-20
Santa Fe, NM | Voz Online - G729a
we use this Codec because of ots extreemly low bandwidth usage, we have tested all of the available codecs and have come to the conclusion that the g729a has excellent efficiency | |
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priller
join:2000-10-20
Gainesville, VA | SunRocket --- G.711 | |
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| markhph
join:2001-03-24 | Re: Who uses what Codec? Do you use Sunrocket with the G711 codec? How is the call quality? Is it like a land line? I'm shopping for nearest-landline-quality and will pay Sunrocket (or any other provider) to get it. | |
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| | lstevens
join:2002-08-17
Brookline, MA | Re: Who uses what Codec? usually bettter.... | |
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newguy2005
join:2004-12-28 | I also asked about the codec for SunRocket, and the rep was unable to confirm this, but he said others also asked, and he thinks they use G.711. | |
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| davidlear
join:2004-07-22 | Re: Who uses what Codec? Grandstreams GXP-2000 has interesting feature - it shows you the codec being used ! thats the neatest way, just dial away to the provider in question. | |
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louisd
join:2004-08-14
Ashburn, VA
| Update for BroadVoice:
The currently have g.711u available on all proxy servers.
In addition g.726-32 and g.729a are available on the Chicago proxy. The intent is that both will become available on all proxies after testing is completed.
Please note: As of right now, no matter what codec you select for calls this will only change outgoing calls. When you get a call their servers are always going to lock on g.711u. In fact, when I made g.726-32 available as my only codec, inbound calls failed. | |
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kitonne
join:2004-08-20
Highland Park, IL | Sipphone is currently using G711 and GSM on their PSTN gateway; 800 numbers gateway is using G711 only, afaik
nufone.net is using G711 and G729 - will take your preferred codec | |
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tj008
join:2004-06-24
Cincinnati, OH | Adding to the research...
Dialpad uses g723.1
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| tj008
join:2004-06-24
Cincinnati, OH | Re: Who uses what Codec? Clarification from different CS rep:
Dialpad uses g729a for line 1. Line 2 uses g723.1.
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vonsen
Just Because
Premium
join:2005-01-06
1 edit | Lingo firmware upgrade addes g726 codec to customers using the utstarcom adapter. Lingo uses g729 by default, also capable of negotiating g711 if remote end does not have g729. It's not clear if T38 has been implemented for faxing.
edit: to clarify T38 status
--
Email these Lingo executives about the misrepresented 18% hike: psingh@primustel.com,nhazard@primustel.com,tkloster@primustel.com,jdepodesta@primustel.com,t book@primustel.com,smcintyre@primustel.com,anayar@primustel.com,tlawson@primustel.com,mguirg is@primustel.com,jmelick@primustel.com,jrosenblatt@primustel.com,ghicks@primustel.com,mmagil l@primustel.com | |
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mskeven
join:2004-09-08
inida | mutualphone.com uses G729 and G.723 now | |
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Corvus
Flaming Tards Since 2003
Premium,VIP
join:2003-11-26 | Videotron.com Cable VoIP
G.711 | |
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| d2classic
join:2004-12-11
Dayton, OH
| Re: Who uses what Codec? I have no idea which codec I use. I have Vonage, and I logged into the vonage.com site and set my bandwidth to the middle. (50kbps? I think). When I have it to 90kbps, the person on the other end can not hear me clear, and they are way too loud in my ear, even with my phone volume set to low. I have roadrunner 5meg down, 384kb up.
In another subject, my VOIP quality dramatically improved as soon as I ditched my linksys router and went to a astaro secure linux firewall setup.
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(topic move) DUV-1000 Experience?
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