Hi All,<br>
<br>
Mohammed, which IP Phones are you using?<br>
<br>
There is something also I'm confused about all this Codec and bandwidth issue.<br>
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.<br>
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.<br>
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.<br>
Any ideas on why this is happening?<br>
<br>
Regards<br>
HASSAAN<br>
<br>
<br><br><div><span class="gmail_quote">On 5/27/05, <b class="gmail_sendername">Mohamed Omar</b> <<a href="mailto:amatek2004@yahoo.ca">amatek2004@yahoo.ca</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>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.</div>
<div> </div>
<div>thanks</div>
<div> </div>
<div>Mohamed</div><div><span class="e" id="q_1041f0d7434cdc33_1">
<div> </div>
<div><br><br><b><i>Jorge Crichigno <<a href="mailto:jcrichigno@conexion.com.py" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">jcrichigno@conexion.com.py</a>></i></b> wrote:</div>
</span></div><blockquote style="border-left: 2px solid rgb(16, 16, 255); padding-left: 5px; margin-left: 5px;"><div><span class="e" id="q_1041f0d7434cdc33_3">I think the data rates with overhead are as follow:<br><br>----------------------------------------------------------------
<br>iLBC - 30 ms (a packet each 30 ms)<br><br>RTP payload: 50 bytes --> Rate: 13.3 Kbps <br>RTP: 62 bytes<br>UDP: 70 bytes<br>IP: 90 bytes --> total rate: 24 Kbps<br><br>-------------------------------------------------------------------
<br>iLBC - 20 ms (a packet each 20 ms)<br><br>RTP payload: 38 bytes --> Rate: 15.2 Kbps <br>RTP: 50 bytes<br>UDP: 58 bytes<br>IP: 78 bytes --> total rate: 31.2 Kbps<br><br>-------------------------------------------------------------------
<br>G.729 - 2 voice frame per packet<br><br>RTP payload: 20 bytes --> Rate: 8 Kbps <br>RTP: 32 bytes<br>UDP: 40 bytes<br>IP: 60 bytes --> Total rate: 24 Kbps<br><br>-------------------------------------------------------------------
<br>G.729 - 4 voice frame per packet<br>
<br>RTP
payload: 40 bytes --> Rate: 8 Kbps <br>RTP: 52 bytes<br>UDP: 60 bytes<br>IP: 80 bytes --> Total rate: 16 Kbps<br><br>-------------------------------------------------------------------<br>G.711 - 20 ms (a packet each 20 ms)
<br><br>RTP payload: 160 bytes --> Rate: 64 Kbps <br>RTP: 172 bytes<br>UDP: 180 bytes<br>IP: 200 bytes --> Total rate: 80 Kbps<br><br><br><br>El vie, 27-05-2005 a las 10:36, Iqbal escribió:<br>> the 5.3, 6.3K are really theoretical, i dont think they include IP
<br>> overheads, I used media_sessions.phtml, and looked at the actual calls <br>> per codec, and I dont think u can really get a good call without 50-70K, <br>> also most bandwidth providers (at least here in the UK) are
<br>> asymmetrical, so even on a 128K, u could have problems.<br>> <br>> Having said that I have done a nice call on xlite using ilbc on dial up.<br>> <br>> Iqbal<br>> <br>> Kofi Obiri-Yeboah wrote:<br>
> <br></span></div>> >Just to add a fe
w more
details, Greger is right to point out the quality<span class="q"><br>> >inferiority of G.723 compared to those of G711 and G729. In fact, in most VOIP<br>> >deployments, in order to quarantee interoperability, a minimum bandwidth of
<br>> >128K is specified. However to reach the wider "lower bandwidth areas" most<br>> >service providers are opting for G.723 which uses either 5.3 or 6.3K. At this<br>> >low bandwidth transmission needs, one could literally reach "dial up modem"
<br>> >equipped areas. in fact most VOIP phone hardware and software are begining to<br>> >specify G.723 as their default codec. Note that until the direct media<br>> >connection phase of a VOIP vall setup, wide bandwidth is not required. Also
<br>> >note that analogue phones have a maximim bandwidth need of 3K, hence even the<br>> >low quality of G.723/5.3K, compared to the average analogue phone call, is<br>> >superior<br>> > <br>> >
<br></span>> <
BR>>
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