yuna_admirer
join:2005-12-19
34567
| reply to Test99
Re: Who uses what Codec?
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. |
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Test99
Premium
join:2003-04-24
San Jose, CA | reply to wiggles4
Inphonex supports G711, GSM, iLBC and G729. Not sure if that is the complete list.
--
FWD 652917 |
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Nate425
Premium
join:2005-02-03
Charlottesville, VA
clubs: | reply to bruno6723
Wow, way to dig this one up  |
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bruno6723
join:2005-07-21
switzerland
| reply to muppetmaster
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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davidlear
join:2004-07-22 | reply to newguy2005
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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VoiceWingRep
Premium
join:2005-07-28 | reply to nsumner
Verizon VoiceWing has standardized on G.711. G.711a as default and G.711u when the connection allows. |
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tlpintpe
join:2002-09-13
Spicewood, TX
| reply to wiggles4
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. |
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pende_tim
Premium
join:2004-01-04
Andover, NJ | reply to wiggles4
VoIP.net ? what codec(s) do they use? |
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VTSherwood
join:2005-07-18
Columbus, OH
1 edit | reply to muppetmaster
ViaTalk (yes I'm an employee) uses:
G.711u (Ulaw Compression) |
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usa2k
Please PRAY for Rebekah
Premium,MVM
join:2003-01-26
Canton, MI
clubs:
 ·VOIPo
 ·WOW Internet and C..
·Broadvox Direct
|  reply to hesty
Re: Who uses what Codec?
said by 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. 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 |
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hesty
join:2001-09-16
Vancouver, BC | reply to wiggles4
Re: Who uses what Codec?
Why is nobody using speex or speex wideband? Speex wideband sounds much better than G.711 and uses less bandwidth. Also, they're free. |
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DracoFelis
Premium
join:2003-06-15 | reply to wiggles4
DialPad.com shows G723 as their "preferred CODEC". But my testing today confirms that they also support G729a. |
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mike_s104
join:2005-04-12
Winchester, VA | reply to troutster
troutster:
»en.wikipedia.org/wiki/PacketCable |
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troutster
join:2002-07-09
Hawthorne, NJ | reply to wiggles4
Does anyone know what protocol Optimum Voice from Cablevision is using? |
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mike_s104
join:2005-04-12
Winchester, VA | reply to wiggles4
I ran into this issue when I was playing with ARP poisoning in Cain and Abel...
Vonage: G.711/G.721/G.729 |
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vladl
join:2003-05-25
Princeton, NJ | reply to montano
TelaSIP uses G.711, G.726, G.729 and GSM. |
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montano
join:2001-04-29
Central Cali | reply to wiggles4
Telasip- G711
InPhonex- G711 |
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vonsen
Just Because
Premium
join:2005-01-06
1 edit | reply to wiggles4
Lingo: Customer can now set default codec to g711
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 |
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lstevens
join:2002-08-17
Brookline, MA | reply to markhph
Re: Who uses what Codec?
usually bettter.... |
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markhph
join:2001-03-24 | reply to priller
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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