Who uses what Codec? in VOIP Tech Chat http://www.dslreports.com/forum/r11582674 en Fri, 05 Dec 2008 05:22:36 EDT Fri, 05 Dec 2008 05:22:36 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,15057138 yuna_admirer : For all the broadband service, codec is matter only when dealing with their carriers. Both Incoming and Outgoing.

Like Vonage, they must have bought Voice-Route (voice-path) from several different carriers such as Qwest, AT&T, blah blah, for their A-to-Z (every countries), then they put on a "routing-table", sort by Price and some other parameters such as ASR or ALOC, but mostly Price.

So, Vonage have to depend on Qwest or AT&D Codec issue, if they connect using ISDN or T3 or E3 or even SS7, then this will not be an issue, however if they connect through H323 or SIP with force RTP stream, they will tend to live with G729 or g723.

For incoming service, such as Lever 3 for example, using SIP, which leave the codec negotiation for end-users, will not have a standard codex to use.

So, in short, the SP standard codecs depend on:

1. Their Carrier
2. Their customer's UA

The most desirable is to use g729, since it's strong, fast, less bandwitdh and widely supported. The only bad thing is it's licensed.

Most of the paid device (ata, ip phone, some SIP softphone) support for g729. Some don't such as Free X-lite. Most carrier do support g729. So that's why g729 is a must have codec, plus the rate is 8000kbps, equal to 1 Sampling instance of g711 (64kbps = 8x8000kbps), So it's quite easy to change from g729 to g711 without consuming so many hardware perfomance. This often happen in those stateful RTP proxy where multiple codecs are supported.

Hope this help.]]> http://www.dslreports.com/forum/remark,15057138 Mon, 19 Dec 2005 15:20:44 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,14979319 Test99 : Inphonex supports G711, GSM, iLBC and G729. Not sure if that is the complete list.
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FWD 652917]]> http://www.dslreports.com/forum/remark,14979319 Thu, 08 Dec 2005 21:46:14 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,14818353 Nate425 : Wow, way to dig this one up :)]]> http://www.dslreports.com/forum/remark,14818353 Wed, 16 Nov 2005 13:10:48 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,14818100 bruno6723 :
said by muppetmaster See Profile :

I have 4MBit down/750Kbit up and I use ULAW and G729 depending on which service I use.
:)]]> http://www.dslreports.com/forum/remark,14818100 Wed, 16 Nov 2005 12:36:47 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,14479822 davidlear : 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.]]> http://www.dslreports.com/forum/remark,14479822 Fri, 30 Sep 2005 23:18:52 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,14245388 VoiceWingRep : Verizon VoiceWing has standardized on G.711. G.711a as default and G.711u when the connection allows.]]> http://www.dslreports.com/forum/remark,14245388 Mon, 29 Aug 2005 09:46:48 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,14060839 tlpintpe : I live in Asia. Overcoming latency is a challenge. I have tried ulaw, and while it sounds good, with roundtrip latency approaching or higher than 300ms (depending where the voip servers are located in the USA), I get a lot of talk over with that codec.

All my outbound calling to the USA is over Voxee from my asterisk box (with iax2). Inbound is handled by myphonecompany.

I have started using the iLbc codec between my asterisk box and Voxee. It is working well. Clear, crisp, with no (or not much talk over).

My myphonecompany asterisk connection is using ulaw (because that is what they support).

On all my sip phones in the house (I use one Cisco ATA 186 and two Sipura SPA-3000) I use g.711 (ulaw) ONLY. That is because I read somewhere that if you use a codec that is highly compressed and connect internally to a sip extension with a different high-compression codec that the results are not good.

Again, I have this set up to defeat problems caused by high latency.]]> http://www.dslreports.com/forum/remark,14060839 Thu, 04 Aug 2005 20:38:32 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,14060723 pende_tim : VoIP.net ? what codec(s) do they use?]]> http://www.dslreports.com/forum/remark,14060723 Thu, 04 Aug 2005 20:27:10 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,14040581 VTSherwood : ViaTalk (yes I'm an employee) uses:
G.711u (Ulaw Compression)]]> http://www.dslreports.com/forum/remark,14040581 Tue, 02 Aug 2005 13:37:43 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13821228 usa2k :
said by hesty See Profile:

Why is nobody using speex or speex wideband? Speex wideband sounds much better than G.711 and uses less bandwidth. Also, they're free.
Interesting and easy URL »www.speex.org/

Nice tip!

I guess it has to do with what hardware developers have used, and what VoIP uses in general. I see »www.speex.org/projects.html shows that it can be used with Asterisk and other developments -- all in good time for commercial mainstream. There is nothing like the momentum of free software development when it gets noticed.
--
Jim -- USA2K
SEE: |DCWU |FP |FAH |BVX REVIEW |
FWD, Vonage 23mths-12/04,& BVX 07/04-now]]> http://www.dslreports.com/forum/remark,13821228 Tue, 05 Jul 2005 21:58:21 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13820806 hesty : Why is nobody using speex or speex wideband? Speex wideband sounds much better than G.711 and uses less bandwidth. Also, they're free.]]> http://www.dslreports.com/forum/remark,13820806 Tue, 05 Jul 2005 21:08:00 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13633693 DracoFelis : DialPad.com shows G723 as their "preferred CODEC". But my testing today confirms that they also support G729a.]]> http://www.dslreports.com/forum/remark,13633693 Sat, 11 Jun 2005 13:34:26 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13609649 mike_s104 : troutster:

»en.wikipedia.org/wiki/PacketCable]]> http://www.dslreports.com/forum/remark,13609649 Wed, 08 Jun 2005 15:46:27 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13608507 troutster : Does anyone know what protocol Optimum Voice from Cablevision is using?]]> http://www.dslreports.com/forum/remark,13608507 Wed, 08 Jun 2005 13:33:14 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13606743 mike_s104 : I ran into this issue when I was playing with ARP poisoning in Cain and Abel...

Vonage: G.711/G.721/G.729]]> http://www.dslreports.com/forum/remark,13606743 Wed, 08 Jun 2005 09:48:58 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13594893 vladl : TelaSIP uses G.711, G.726, G.729 and GSM.]]> http://www.dslreports.com/forum/remark,13594893 Mon, 06 Jun 2005 21:35:06 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13553401 montano : Telasip- G711
InPhonex- G711]]> http://www.dslreports.com/forum/remark,13553401 Wed, 01 Jun 2005 20:45:02 EDT Lingo: Customer can now set default codec to g711 http://www.dslreports.com/forum/remark,13538142 vonsen : Lingo has now added a option on their web portal where the customer can change the default codec from g729 to g711 if they wish. G711 support before was limited to autodetect & switch for fax calls or when the remote party did not support g729.

edit: does not appear to work for older azatel adapters. Confirmed working for utstarcom.

--
                                                                                                                             five stars shy]]> http://www.dslreports.com/forum/remark,13538142 Tue, 31 May 2005 05:30:25 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13480869 lstevens : usually bettter....]]> http://www.dslreports.com/forum/remark,13480869 Tue, 24 May 2005 06:21:24 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13480067 markhph : 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.]]> http://www.dslreports.com/forum/remark,13480067 Tue, 24 May 2005 00:38:23 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13390405 probert744 : What deos Speak easy use? Speakeasy.net]]> http://www.dslreports.com/forum/remark,13390405 Thu, 12 May 2005 11:26:56 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13374739 bigpapae35 : The sound qulaity and jitter has alot to do with your internet connection as well, for example I recently switched from Optimum online cable internet to Verizon Fios, and quality of my voip has dramitically improved, no more packet loss, ping times have been reducts, and much more stable connection.]]> http://www.dslreports.com/forum/remark,13374739 Tue, 10 May 2005 13:40:44 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13334260 Snickerdo : TalkBroadband uses G.711 for users with full broadband connections, and G.729 for users with 'Lite' connections.]]> http://www.dslreports.com/forum/remark,13334260 Thu, 05 May 2005 03:32:40 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13246590 DSL Lab Rat : When discussing bandwidth of different codecs, often the sample rate used is not taken into account, and also the numbers often quoted are for payload, IP layer, or link layer without explanation as to which one is being discussed.

This links to a VoIP bandwidth calculator that allows you to select various codecs and sampling rates, and then show bandwidth at the various layers ... this helps to see the variations more clearly...

»www.packetizer.com/voip/diagnost···alc.html
--
"Everyone is entitled to his own opinion, but not to his own facts."
Senator Daniel Patrick Moynihan (Something I can agree on with a Democrat)]]> http://www.dslreports.com/forum/remark,13246590 Sun, 24 Apr 2005 04:30:41 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13235747 eperos :
said by schweb See Profile:

AT&T CallVantage uses:

G726 normally or G711 with Fax and Modem support turned on.
I do not think Cv uses G.726.
--
Use. Earthlink Cable (TWC) 5/384 ...Voip Service, D-Link (DVG-1120M) AT&T CallVantage - 2 lines... Pc Behind D-Link]]> http://www.dslreports.com/forum/remark,13235747 Fri, 22 Apr 2005 17:04:36 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13150573 hoffa3 : Is that Kilobytes per second or kilobits per second? My cable connection can only do about 512kilobit upload. ]]> http://www.dslreports.com/forum/remark,13150573 Tue, 12 Apr 2005 12:36:44 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13149701 xterraa : »www.mybroadline.com uses G.711 and G.726]]> http://www.dslreports.com/forum/remark,13149701 Tue, 12 Apr 2005 10:29:16 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,13062743 tj008 : Nuvio uses g711 (High Quality) and g729 (Normal Quality) codecs. They are user selectable.



]]> http://www.dslreports.com/forum/remark,13062743 Fri, 01 Apr 2005 13:20:29 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12835400 nzaman :
said by quisp65 See Profile:

Through searches through Stanaphone's forums it is stated Stanaphone uses g.711u & GSM.
I'm using StanaPhone too and G723 is also compatible.]]> http://www.dslreports.com/forum/remark,12835400 Sat, 05 Mar 2005 00:19:50 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12835363 nzaman : If you mean Net2Phone Voiceline, then they use G729. I'm a happy FWD user who only makes in-network calls other than telco. I have a Sipura SPA-2000 on G723. Awsome! I have a 6mbps/768k line and my SPA only uses hardly 5-7 KBPS with G723!]]> http://www.dslreports.com/forum/remark,12835363 Sat, 05 Mar 2005 00:12:27 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12833851 schweb : AT&T CallVantage uses:

G726 normally or G711 with Fax and Modem support turned on.]]> http://www.dslreports.com/forum/remark,12833851 Fri, 04 Mar 2005 20:53:23 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12727580 DPChris : Hi,

Dialpad uses G.723.1 codec and bandwidth requirement is 34 Kbps.

Thx,
DPChris
Tier 1 Tech Support
Dialpad Communications]]> http://www.dslreports.com/forum/remark,12727580 Mon, 21 Feb 2005 04:52:53 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12585044 PhoneBoy : New thread created for this purpose.

»voxilla.com/index.php?name=PNphp···ghlight=
--
See my blog at »blog.phoneboy.com The views expressed herein are not necessarily those of anyone else, including the poster. ]]> http://www.dslreports.com/forum/remark,12585044 Fri, 04 Feb 2005 22:05:33 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12583585 usa2k :
said by PhoneBoy See Profile:

Post any corrections you have to the Voxilla Forums.
Which forum category? Link?]]> http://www.dslreports.com/forum/remark,12583585 Fri, 04 Feb 2005 19:08:32 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12577659 PhoneBoy : Post any corrections you have to the Voxilla Forums. ]]> http://www.dslreports.com/forum/remark,12577659 Fri, 04 Feb 2005 03:21:50 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12575429 usa2k : Ah! Too simple for me :o

Vonage had local numbers all over USA to check VM.
(I never used them. But I think they still do.)]]> http://www.dslreports.com/forum/remark,12575429 Thu, 03 Feb 2005 21:37:46 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12575315 reebok : follow the boxes. there are only two choices in the first one and I can tell you "None" isn't the right one.
--
John
Webmaster
»www.FileFlash.com]]> http://www.dslreports.com/forum/remark,12575315 Thu, 03 Feb 2005 21:25:33 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12575312 caseydoug : Use the drop-down list, and then select the providers, and hit "compare."]]> http://www.dslreports.com/forum/remark,12575312 Thu, 03 Feb 2005 21:25:25 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12575240 usa2k : Is it broken? I just see a few adds. :hmm:]]> http://www.dslreports.com/forum/remark,12575240 Thu, 03 Feb 2005 21:17:35 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12574862 caseydoug : Great link, Phoneboy. Thanks. Not 100% accurate, but pretty close for Lingo.]]> http://www.dslreports.com/forum/remark,12574862 Thu, 03 Feb 2005 20:42:51 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12574580 PhoneBoy : Here's a nice comparison of different service providers. Codecs used by the providers are actually listed.

»voxilla.com/compare/compare.php
--
See my blog at »blog.phoneboy.com The views expressed herein are not necessarily those of anyone else, including the poster. ]]> http://www.dslreports.com/forum/remark,12574580 Thu, 03 Feb 2005 20:13:23 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12567759 anon : Just got a D-Link DVG-1402S VoIP Router activated on Lingo.
After searching down Primus's UserName/Password, I can now see that router is set up for primary = G.729a and secondary = G.711 u-Law.]]> http://www.dslreports.com/forum/remark,12567759 Thu, 03 Feb 2005 04:37:05 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12557550 quisp65 : Through searches through Stanaphone's forums it is stated Stanaphone uses g.711u & GSM. ]]> http://www.dslreports.com/forum/remark,12557550 Wed, 02 Feb 2005 01:58:04 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12520095 d2classic : 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.

]]> http://www.dslreports.com/forum/remark,12520095 Sat, 29 Jan 2005 01:11:23 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12492593 Corvus : Videotron.com Cable VoIP

G.711]]> http://www.dslreports.com/forum/remark,12492593 Wed, 26 Jan 2005 10:08:58 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12477727 mskeven : Do you understand the deference between
G.711u-law and G.711a-law?

---------one is US standard
one is Europe standard]]> http://www.dslreports.com/forum/remark,12477727 Mon, 24 Jan 2005 20:38:29 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12475647 mskeven : mutualphone.com uses G729 and G.723 now]]> http://www.dslreports.com/forum/remark,12475647 Mon, 24 Jan 2005 17:18:26 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12420287 dritchie : 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?]]> http://www.dslreports.com/forum/remark,12420287 Tue, 18 Jan 2005 18:10:41 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12411064 vonsen : 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]]> http://www.dslreports.com/forum/remark,12411064 Mon, 17 Jan 2005 19:10:05 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12342500 tj008 : Clarification from different CS rep:

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

]]> http://www.dslreports.com/forum/remark,12342500 Mon, 10 Jan 2005 09:50:42 EDT Skype codec http://www.dslreports.com/forum/remark,12341473 vonsen : Skype uses the iLBC codec.]]> http://www.dslreports.com/forum/remark,12341473 Mon, 10 Jan 2005 03:18:00 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12327137 tj008 : Adding to the research...

Dialpad uses g723.1

]]> http://www.dslreports.com/forum/remark,12327137 Sat, 08 Jan 2005 11:18:22 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12299048 kitonne : 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]]> http://www.dslreports.com/forum/remark,12299048 Wed, 05 Jan 2005 12:42:43 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12281764 louisd : 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.]]> http://www.dslreports.com/forum/remark,12281764 Mon, 03 Jan 2005 14:51:24 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12262315 lyulyok : 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.]]> http://www.dslreports.com/forum/remark,12262315 Fri, 31 Dec 2004 20:35:48 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12258514 newguy2005 : 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.]]> http://www.dslreports.com/forum/remark,12258514 Fri, 31 Dec 2004 11:58:12 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12239339 priller : SunRocket --- G.711]]> http://www.dslreports.com/forum/remark,12239339 Wed, 29 Dec 2004 08:11:32 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,12177565 savoxis : 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]]> http://www.dslreports.com/forum/remark,12177565 Tue, 21 Dec 2004 11:54:52 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11922205 pcmeet : 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. ]]> http://www.dslreports.com/forum/remark,11922205 Sun, 21 Nov 2004 17:33:47 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11775964 JayDog2004 : maybe these guys can help - »www.downetworks.com]]> http://www.dslreports.com/forum/remark,11775964 Thu, 04 Nov 2004 15:22:57 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11709451 Walla : MSM Netphone uses 711 and 726 - soon to have 729!]]> http://www.dslreports.com/forum/remark,11709451 Thu, 28 Oct 2004 03:42:34 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11708654 SauceMaster : 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!!!!]]> http://www.dslreports.com/forum/remark,11708654 Thu, 28 Oct 2004 00:33:20 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11691483 caseydoug :
said by ieee1394 See Profile:

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.]]> http://www.dslreports.com/forum/remark,11691483 Tue, 26 Oct 2004 10:42:05 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11691045 ieee1394 :
said by digiblur See Profile:

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.]]> http://www.dslreports.com/forum/remark,11691045 Tue, 26 Oct 2004 09:40:53 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11689409 anon : mutualphone - g.729]]> http://www.dslreports.com/forum/remark,11689409 Tue, 26 Oct 2004 01:19:24 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11641541 digiblur : 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. ]]> http://www.dslreports.com/forum/remark,11641541 Wed, 20 Oct 2004 16:44:03 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11640467 gtj : More CODEC info...

»www.voiptalk.us/voip_codecs.shtml

originally from ...

»[Vonage] 90, 50 and 30 "Codecs"]]> http://www.dslreports.com/forum/remark,11640467 Wed, 20 Oct 2004 14:39:35 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11636942 nsumner : 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).]]> http://www.dslreports.com/forum/remark,11636942 Wed, 20 Oct 2004 04:35:36 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11636466 magm58 : nsumner for you info Broadvoice is using the codec G711u]]> http://www.dslreports.com/forum/remark,11636466 Wed, 20 Oct 2004 01:28:45 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11620337 mchung55 : 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.]]> http://www.dslreports.com/forum/remark,11620337 Mon, 18 Oct 2004 14:00:59 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11603030 sgarrand : 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
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Visit »whythehell.com, FWD number 48043, QuantumVoice user with an UNLIMITED residential toll free number for $42, »QuantumVoice.com/rates_800.shtml]]> http://www.dslreports.com/forum/remark,11603030 Sat, 16 Oct 2004 09:39:42 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11602296 adisor19 : ok, so where can we find info on wich codec offers the best voice quality ?

Thanks in advance,

Adi]]> http://www.dslreports.com/forum/remark,11602296 Sat, 16 Oct 2004 03:21:19 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11590940 sgarrand :
said by nsumner See Profile:
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
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Visit »whythehell.com, FWD number 48043, QuantumVoice user with an UNLIMITED residential toll free number for $42, »QuantumVoice.com/rates_800.shtml]]> http://www.dslreports.com/forum/remark,11590940 Thu, 14 Oct 2004 21:54:44 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11590304 wiggles4 : 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. :D]]> http://www.dslreports.com/forum/remark,11590304 Thu, 14 Oct 2004 20:48:53 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11583286 nsumner : 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]]]> http://www.dslreports.com/forum/remark,11583286 Thu, 14 Oct 2004 03:47:50 EDT Re: Who uses what Codec? http://www.dslreports.com/forum/remark,11583092 muppetmaster : I have 4MBit down/750Kbit up and I use ULAW and G729 depending on which service I use.]]> http://www.dslreports.com/forum/remark,11583092 Thu, 14 Oct 2004 02:27:22 EDT Who uses what Codec? http://www.dslreports.com/forum/remark,11582674 wiggles4 : 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.]]> http://www.dslreports.com/forum/remark,11582674 Thu, 14 Oct 2004 00:50:18 EDT