Hi All,
Mohammed, which IP Phones are you using?
There is something also I'm confused about all this Codec and bandwidth issue. I've seen that when I'm talking using my computer via a softphone, G.723 and G.729 takes approximately 24kbps and 32kbps respectively of bandwidth. But, in my terminating dedicated boxes (Quintum in my case), I see that I need to allocate only 14-15 kbps and 17-18 kbps respectively. Sometimes, total bandwidth is even less. I've a 768kbps connection from my ISP under which I'm running around 50 lines. Still, the consumption doesn't go over 600kbps even during peak hours. All my customers are using G.723r63. Any ideas on why this is happening?
Regards HASSAAN
On 5/27/05, Mohamed Omar amatek2004@yahoo.ca wrote:
I use dialup connection with my IPPhones which has a buildin modem without any issue on both codec G723 and G729. I sometime get better quality on the some phone if I use dialup then when I was braodband. this happens when I call most aftrican country where the termination is not good. This is because when I use broadband the media has to through some kinds of NAT transval while the dialup normally gets public IP so no NAT transval and the media gets the shorts path. thanks Mohamed
*Jorge Crichigno jcrichigno@conexion.com.py* wrote:
I think the data rates with overhead are as follow:
iLBC - 30 ms (a packet each 30 ms)
RTP payload: 50 bytes --> Rate: 13.3 Kbps RTP: 62 bytes UDP: 70 bytes IP: 90 bytes --> total rate: 24 Kbps
iLBC - 20 ms (a packet each 20 ms)
RTP payload: 38 bytes --> Rate: 15.2 Kbps RTP: 50 bytes UDP: 58 bytes IP: 78 bytes --> total rate: 31.2 Kbps
G.729 - 2 voice frame per packet
RTP payload: 20 bytes --> Rate: 8 Kbps RTP: 32 bytes UDP: 40 bytes IP: 60 bytes --> Total rate: 24 Kbps
G.729 - 4 voice frame per packet
RTP payload: 40 bytes --> Rate: 8 Kbps RTP: 52 bytes UDP: 60 bytes IP: 80 bytes --> Total rate: 16 Kbps
G.711 - 20 ms (a packet each 20 ms)
RTP payload: 160 bytes --> Rate: 64 Kbps RTP: 172 bytes UDP: 180 bytes IP: 200 bytes --> Total rate: 80 Kbps
El vie, 27-05-2005 a las 10:36, Iqbal escribió:
the 5.3, 6.3K are really theoretical, i dont think they include IP overheads, I used media_sessions.phtml, and looked at the actual calls per codec, and I dont think u can really get a good call without 50-70K,
also most bandwidth providers (at least here in the UK) are asymmetrical, so even on a 128K, u could have problems.
Having said that I have done a nice call on xlite using ilbc on dial up.
Iqbal
Kofi Obiri-Yeboah wrote:
Just to add a fe w more details, Greger is right to point out the
quality
inferiority of G.723 compared to those of G711 and G729. In fact, in
most VOIP
deployments, in order to quarantee interoperability, a minimum
bandwidth of
128K is specified. However to reach the wider "lower bandwidth areas"
most
service providers are opting for G.723 which uses either 5.3 or 6.3K.
At this
low bandwidth transmission needs, one could literally reach "dial up
modem"
equipped areas. in fact most VOIP phone hardware and software are
begining to
specify G.723 as their default codec. Note that until the direct media connection phase of a VOIP vall setup, wide bandwidth is not required.
Also
note that analogue phones have a maximim bandwidth need of 3K, hence
even the
low quality of G.723/5.3K, compared to the average analogue phone call,
is
superior
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