<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<meta name=ProgId content=Word.Document>
<meta name=Generator content="Microsoft Word 10">
<meta name=Originator content="Microsoft Word 10">
<link rel=File-List href="cid:filelist.xml@01C666CC.368E8830">
<!--[if gte mso 9]><xml>
<o:OfficeDocumentSettings>
<o:DoNotRelyOnCSS/>
</o:OfficeDocumentSettings>
</xml><![endif]--><!--[if gte mso 9]><xml>
<w:WordDocument>
<w:SpellingState>Clean</w:SpellingState>
<w:GrammarState>Clean</w:GrammarState>
<w:DocumentKind>DocumentEmail</w:DocumentKind>
<w:HyphenationZone>21</w:HyphenationZone>
<w:EnvelopeVis/>
<w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel>
</w:WordDocument>
</xml><![endif]-->
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Courier;
panose-1:2 7 4 9 2 2 5 2 4 4;
mso-font-alt:"Courier New";
mso-font-charset:0;
mso-generic-font-family:modern;
mso-font-format:other;
mso-font-pitch:fixed;
mso-font-signature:3 0 0 0 1 0;}
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;
mso-font-charset:2;
mso-generic-font-family:auto;
mso-font-pitch:variable;
mso-font-signature:0 268435456 0 0 -2147483648 0;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;
mso-font-charset:0;
mso-generic-font-family:swiss;
mso-font-pitch:variable;
mso-font-signature:1627421319 -2147483648 8 0 66047 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-style-parent:"";
margin:0cm;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:"Times New Roman";
mso-fareast-font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;
text-underline:single;}
a:visited, span.MsoHyperlinkFollowed
{color:blue;
text-decoration:underline;
text-underline:single;}
span.EstiloDeEmail17
{mso-style-type:personal-reply;
mso-style-noshow:yes;
mso-ansi-font-size:10.0pt;
mso-bidi-font-size:10.0pt;
font-family:Arial;
mso-ascii-font-family:Arial;
mso-hansi-font-family:Arial;
mso-bidi-font-family:Arial;
color:navy;}
span.SpellE
{mso-style-name:"";
mso-spl-e:yes;}
span.GramE
{mso-style-name:"";
mso-gram-e:yes;}
@page Section1
{size:612.0pt 792.0pt;
margin:70.85pt 3.0cm 70.85pt 3.0cm;
mso-header-margin:35.4pt;
mso-footer-margin:35.4pt;
mso-paper-source:0;}
div.Section1
{page:Section1;}
/* List Definitions */
@list l0
{mso-list-id:1312323532;
mso-list-template-ids:1159990666;}
@list l0:level1
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:36.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Symbol;}
@list l1
{mso-list-id:1875579896;
mso-list-template-ids:2115017412;}
@list l1:level1
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:36.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Symbol;}
@list l2
{mso-list-id:2070767002;
mso-list-template-ids:-41497694;}
@list l2:level1
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:36.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Symbol;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
-->
</style>
<!--[if gte mso 10]>
<style>
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Tabela normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.0pt;
font-family:"Times New Roman";}
</style>
<![endif]-->
</head>
<body lang=PT-BR link=blue vlink=blue style='tab-interval:35.4pt'>
<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Quando usado em <span class=SpellE>trunk</span>
<span class=SpellE>vc</span> elimina o overhead do IP, por isto não fica o
dobro.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Abraço,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Savio<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Mensagem original-----<br>
<b><span style='font-weight:bold'>De:</span></b> asteriskbrasil-bounces@listas.<span
class=GramE>asteriskbrasil</span>.<span class=GramE>org</span>
[mailto:asteriskbrasil-bounces@listas.asteriskbrasil.org] <b><span
style='font-weight:bold'>Em nome de </span></b>igor bellino<br>
<b><span style='font-weight:bold'>Enviada em:</span></b> domingo, 23 de abril
de 2006 11:40<br>
<b><span style='font-weight:bold'>Para:</span></b> asteriskbrasil@listas.<span
class=GramE>asteriskbrasil</span>.<span class=GramE>org</span><br>
<b><span style='font-weight:bold'>Assunto:</span></b> [AsteriskBrasil] Consumo
IAX</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:
12.0pt;margin-left:35.4pt'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> Estava dando uma explorada no
site e achei a dica abaixo sobre os protocolos para truncking e me surgiram
algumas dúvidas.<br>
1) porque quando se usam <span class=GramE>2</span>
canais o consumo não é o dobro de usar apenas 1 ?<br>
2) o codec g729a é realmente o mais interessante
quando se diz respeito <span class=GramE>a</span> banda, tanto para comunicação
com a ponta final, como para o trucking (desde que se tenha ótimas máquinas e a
prioriedade seja o consumo de banda) ? <br>
<br>
<br>
<br>
-------------------------------------------------<br>
Segundo o link <a href="http://www.voip-info.org/wiki-Asterisk+bandwidth+iax2">http://www.voip-info.org/wiki-Asterisk+bandwidth+iax2</a>
<br>
o consumo de banda é o seguinte (em IAX2 com trunking): <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:71.4pt;text-indent:-18.0pt;mso-list:l2 level1 lfo1;tab-stops:list 71.4pt'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><span class=GramE>ILBC: </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:
12.0pt;margin-left:35.4pt'><font size=3 face=Courier><span style='font-size:
12.0pt;font-family:Courier'> <span class=GramE>one</span> call: 56134.91 bps/67.45 pps (28.0 kbps)
</span></font><br>
<font face=Courier><span style='font-family:Courier'> two calls: 98679.11 bps/102.41 pps (49.3 kbps)
</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:71.4pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2;tab-stops:list 71.4pt'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><span class=GramE>G.729 </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:
12.0pt;margin-left:35.4pt'><font size=3 face=Courier><span style='font-size:
12.0pt;font-family:Courier'> <span class=GramE>one</span> call: 60124.33 bps/101.26 pps (30.0 kbps)
</span></font><br>
<font face=Courier><span style='font-family:Courier'> two calls: 79496.23 bps/102.85 pps (39.7 kbps)
</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:71.4pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3;tab-stops:list 71.4pt'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><span class=GramE>GSM </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3 face=Courier><span
style='font-size:12.0pt;font-family:Courier'> <span class=GramE>one</span> call: 70958.16 bps/102.13 pps (35.4 kbps)
</span></font><br>
<font face=Courier><span style='font-family:Courier'> two calls: 100455.23 bps/102.63 pps (50.2 kbps)
</span></font><br>
<br>
Em comunicação normal, a maioria dos protocolos VOIP transmite a cada 30 <br>
milisegundos. <br>
<br>
Isto dá 33 pacotes por segundo. Quando se fala em 13 kbps, isto é o consumo do <br>
Codec, no nível de aplicação, portanto 13 kbps gera 50 Bytes por pacote no <br>
nível de aplicação, adiciona-se aos 50 bytes os cabeçalhos UDP+IP+os <br>
cabeçalhos da sua banda larga, gerando<span class=GramE> por exemplo</span>
para o Velox isto faz com <br>
que cada pacote VOIP use 159 Bytes, ou seja 42Kbps reais dos 128 Kbps de <br>
upstream para o Velox 256 ou Velox 512. <br>
<br>
Já para Link Dedicado ou Frame Relay, o overhead é muitissimo menor, mais <br>
ainda assim, uns <span class=GramE>8</span> bytes por pacote além dos 28 bytes
do IP+UDP, ou seja, 36 <br>
bytes por pacote VOIP, além do payload (carga pagante/util) de cada pacote.<o:p></o:p></p>
</div>
</body>
</html>