|
|
Joined: Feb 2005
Posts: 102
Member
|
Member
Joined: Feb 2005
Posts: 102 |
I have been trying to learn something about VOIP. My question is what voice coding options you are using. I see that some of the VOIP sets will work with G.711, ADPCM, and G.729. Just a question about the real world of VIP.
|
|
|
Visit Atcom to get started with your new business VoIP phone system ASAP
Turn up is quick, painless, and can often be done same day.
Let us show you how to do VoIP right, resulting in crystal clear call quality and easy-to-use features that make everyone happy!
Proudly serving Canada from coast to coast.
|
|
|
Joined: Sep 2004
Posts: 4,220 Likes: 2
Member
|
Member
Joined: Sep 2004
Posts: 4,220 Likes: 2 |
G7.11 = no compression. G7.29 = compression.
|
|
|
|
Joined: Jan 2005
Posts: 395
Member
|
Member
Joined: Jan 2005
Posts: 395 |
Both G.711 and G.729 are CODECS that are a VoIP standard through which voice information can be encoded into data or decoded back to voice information. Both a Coder and Decoder are necessary on both sides of the telephone call since telephone calls occur simultaneously in both directions. Bandwith is extremely important in maintaining a clear voice path from one point to the next, therefore it is important that all types have the capabilites to :
1. Provide low bandwith (the ability to compress voice data.) 2. Providee high quality for voice calls. 3. Battle against low latency. 4. Reconstruct lost packets.
CODEC G.729 is most favored because it saves available bandwith utilizing high compression/low bandwith and is comparable to cellular phone quality. While CODEC G.711 is not feasible on most networks since it offers low compression/high bandwith and is considered "toll quality" for voice.
There a a multitude of CODEC's out there, but I'm only familiar with G.711, G.726 and G.729. Maybe someone else has knowledge of ADPCM and the benefits of that CODEC. ADPCM isn't even listed in my VoIP reference material.
|
|
|
|
Joined: Feb 2005
Posts: 102
Member
|
Member
Joined: Feb 2005
Posts: 102 |
|
|
|
|
Joined: Jan 2005
Posts: 395
Member
|
Member
Joined: Jan 2005
Posts: 395 |
See there RT you taught me something. I've never seen the two referenced before.
|
|
|
|
Joined: Feb 2005
Posts: 102
Member
|
Member
Joined: Feb 2005
Posts: 102 |
I may not know VOIP but I do know Voice coding. SWBT had a Subscriber Loop Carrier (SLC40) deployed that used ADPCM (G.726). The SLC40 had 40 channels working on a T1 Line. They were replaced because FAX machines and data modems would not work on them.
|
|
|
Forums84
Topics94,513
Posts639,937
Members49,844
|
Most Online5,661 May 23rd, 2018
|
|
1 members (EV607797),
146
guests, and
45
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
|
|
|