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 few 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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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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there are so many factors in your setting that can affect your bandwith. for example if you are using G723r63 for one channel without AVD and I frame per packet this is what you will consume:
Codec payload = 6.3K codec payload + RTP =9.6K Codec payload + RTP + UDP = 11K codec payload + RTP +UDP + IP = 17K. Total per channel.
if you set your codec to 2 frames per packet the total bandwith will go down to 11K from 17K. and when you add AVD then bandwith can go down to an avarage of 4K per channell but you still need the maximum bandwidth 11K or 17K per channel depending on the number frames per packet. the advantage of AVD is that you will be able to sequeeze in more channels oan the same bandwidth.
thanks
Mohamed omar
Nyamul Hassaan nyamul@gmail.com wrote: 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 escribi�:
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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-
Mohamed Omar -
Nyamul Hassaan