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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.

muppetmaster

join:2002-10-22
Barcelona
I have 4MBit down/750Kbit up and I use ULAW and G729 depending on which service I use.

nsumner

join:2001-12-13
Israel

1 edit

3 recommendations

reply to wiggles4
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

-----
[Edited by request. --kc]

wiggles4

join:2004-10-09
Eugene, OR
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.


sgarrand
Insert Witty Phrase Here
Premium
join:2000-04-13
West Brookfield, MA
reply to nsumner
said by nsumner:
Quantum Voice: ?
That would be G711u and G729a for QuantumVoice. You can choose and use either in the SPA-2000 config for their service.

Scott
--
Visit »whythehell.com, FWD number 48043, QuantumVoice user with an UNLIMITED residential toll free number for $42, »QuantumVoice.com/rates_800.shtml


adisor19

join:2004-10-11
ok, so where can we find info on wich codec offers the best voice quality ?

Thanks in advance,

Adi


sgarrand
Insert Witty Phrase Here
Premium
join:2000-04-13
West Brookfield, MA

1 recommendation

Try this site: »www.voip-info.org/wiki-Codecs

There is a lot of information out there about codecs. This thread also mentions more links: »[Primus] What determins GOOD voice quality?

Scott
--
Visit »whythehell.com, FWD number 48043, QuantumVoice user with an UNLIMITED residential toll free number for $42, »QuantumVoice.com/rates_800.shtml

mchung55

join:2003-09-04
Lisle, IL
reply to wiggles4
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.

magm58

join:2000-07-12
East Elmhurst, NY
reply to nsumner
nsumner for you info Broadvoice is using the codec G711u

nsumner

join:2001-12-13
Israel
reply to wiggles4
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).

gtj

join:2001-12-10
Golden, CO
reply to wiggles4


digiblur
Premium
join:2002-06-03
Louisiana
reply to wiggles4
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.


daguy

@rr.com
reply to wiggles4
mutualphone - g.729

ieee1394
Premium
join:2001-08-25
Washington
reply to digiblur
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.

caseydoug

join:2001-08-14
Seattle, WA
kudos:5
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.

SauceMaster

join:2004-08-01
Kokomo, IN
reply to wiggles4
I use the G.711 on a 400/256k connection scored a 4.1 MOS , 4.4 was the best.

»www.testyourvoip.com/details.html?id=HX2FJY
--
Broadcasting The Classic Hits 24/7 SauceMaster Radio!!!!

Walla

join:2004-02-26
Israel
reply to wiggles4
MSM Netphone uses 711 and 726 - soon to have 729!

JayDog2004

join:2004-09-28
Atlanta, GA
reply to wiggles4
maybe these guys can help - »www.downetworks.com


pcmeet
Official Dta Guru

join:2003-09-15
Montgomery, AL
reply to nsumner
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.

savoxis

join:2004-12-20
Santa Fe, NM
reply to wiggles4
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

priller

join:2000-10-20
Gainesville, VA
reply to wiggles4
SunRocket --- G.711


newguy2005

join:2004-12-28
reply to wiggles4
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.

lyulyok
Premium
join:2004-04-15
Seattle, WA
reply to nsumner
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.

louisd

join:2004-08-14
Ashburn, VA
reply to wiggles4
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.

kitonne

join:2004-08-20
Highland Park, IL
reply to wiggles4
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

tj008

join:2004-06-24
Cincinnati, OH
reply to wiggles4
Adding to the research...

Dialpad uses g723.1



vonsen
Just Because
Premium
join:2005-01-06
reply to wiggles4

Skype codec

Skype uses the iLBC codec.

tj008

join:2004-06-24
Cincinnati, OH
reply to tj008

Re: Who uses what Codec?

Clarification from different CS rep:

Dialpad uses g729a for line 1. Line 2 uses g723.1.



vonsen
Just Because
Premium
join:2005-01-06

1 edit
reply to wiggles4
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

--
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dritchie

join:2001-05-07
Euclid, OH
reply to nsumner
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?