<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><BR><DIV><DIV>On 2 Feb 2006, at 08:09, Cosmin Prund wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><O:SMARTTAGTYPE namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName"> <DIV class="Section1"><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy">Brrghhh: Bandwidth calculation is really foggy for me:<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">Using the calculator I’m getting about 23 kbps for both incoming and outgoing. What does this mean: Is a 64kbit link used at 71% capacity ((23+23):64) or is it used at only 35% (23:64)? Will this vary over time (i.e: does the codec generate more then average data at times? How about less then average?)</SPAN></FONT></P></DIV></O:SMARTTAGTYPE></BLOCKQUOTE><DIV><BR class="khtml-block-placeholder"></DIV><DIV>It depends on what sort of link you have. Most links are full duplex (leased lines etc) which would be 35%</DIV><DIV>but some radio based links are half duplex which would be 71%</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>So for a 64k link you will (just about) get 3 729 calls. </DIV><DIV>If all the calls between are between the same two servers, you can use IAX trunking, which would push</DIV><DIV>you up to 5 calls. (What that tells you is that for 729 and gsm, the headers are as big as the data).</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>You talk about satellite stations, if you are going for a hub and spoke, you should put the hub</DIV><DIV>on the highest bandwidth link. </DIV><BR><BLOCKQUOTE type="cite"><O:SMARTTAGTYPE namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName"><DIV class="Section1"><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="3" face="Times New Roman"><SPAN style="font-size: 12.0pt"> <O:P></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt">Thanks. </SPAN></FONT><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"><O:P> </O:P></SPAN></FONT></P> <DIV style="border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt"> <DIV> <DIV class="MsoNormal" align="center" style="text-align:center"><FONT size="3" face="Times New Roman"><SPAN lang="EN-US" style="font-size:12.0pt"> <HR size="2" width="100%" align="center" tabindex="-1"> </SPAN></FONT></DIV><P class="MsoNormal"><B><FONT size="2" face="Tahoma"><SPAN lang="EN-US" style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</SPAN></FONT></B><FONT size="2" face="Tahoma"><SPAN lang="EN-US" style="font-size:10.0pt;font-family:Tahoma"> asterisk-users-bounces@lists.digium.com [<A href="mailto:asterisk-users-bounces@lists.digium.com">mailto:asterisk-users-bounces@lists.digium.com</A>] <B><SPAN style="font-weight:bold">On Behalf Of </SPAN></B>Rob Lith<BR> <B><SPAN style="font-weight:bold">Sent:</SPAN></B> Wednesday, February 01, 2006 11:40 PM<BR> <B><SPAN style="font-weight:bold">To:</SPAN></B> <ST1:PERSONNAME w:st="on">Asterisk Users Mailing List - Non-Commercial Discussion</ST1:PERSONNAME><BR> <B><SPAN style="font-weight:bold">Subject:</SPAN></B> Re: [Asterisk-Users] (newby) IAX Trunk on low bandwidth connection</SPAN></FONT><SPAN lang="EN-US"><O:P></O:P></SPAN></P> </DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt"><O:P> </O:P></SPAN></FONT></P><P class="MsoNormal" style="margin-bottom:12.0pt"><FONT size="3" face="Times New Roman"><SPAN style="font-size:12.0pt">What codec is that using. G.729 will give you 10 calls at best over 256k unless you're trunking with IAX2? I don't know anyone using lpc10...<BR> <BR> Remember a G.729 8k codec turns into 23.63 Kbps with all the overheads... <BR> <BR> Regards<BR> Rob<O:P></O:P></SPAN></FONT></P> <DIV><P class="MsoNormal"><SPAN class="gmailquote"><FONT size="3" face="Times New Roman"><SPAN style="font-size:12.0pt">On 2/1/06, <B><SPAN style="font-weight:bold">Garth van Sittert</SPAN></B> <<A href="mailto:garth@bitco.co.za">garth@bitco.co.za</A>> wrote:</SPAN></FONT></SPAN><O:P></O:P></P><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt">Hi Cosmin<BR> <BR> You should be able to get about 12 simultaneous calls on a 128k line and<BR> about 28 on a 256k line according to asteriskguru's bandwidth calculator<BR> <A href="http://www.asteriskguru.com/tools/bandwidth_calculator.php">http://www.asteriskguru.com/tools/bandwidth_calculator.php</A>.<BR> <BR> Kind Regards<BR> Garth<BR> <BR> BitCo Data Communications<BR> <A href="http://www.bitco.co.za">http://www.bitco.co.za</A><BR> <BR> Cosmin Prund wrote:<BR> > Hello everyone, this is my first post to the list, so hello again. <BR> ><BR> > We're a small company in Romania and we're trying to set up a really small<BR> > version of "call center". That is, we want to get a few land-lines from our<BR> > telco in different countys and "bridge" all calls to our HQ, in order to <BR> > make it cheeper for our clients to call us.<BR> ><BR> > Unfortunatelly there's no ISP in our area that can deliver a broadband<BR> > connection for anything less then an arm and a leg, so we're considering<BR> > runing an * <-> * connection using VoIP over a low bandwidth connection<BR> > (we're considering 128kbit but we might be able to go to 256kbit).<BR> ><BR> > The bandwidth price is not a problem for our "satelite" installations, we <BR> > cand get acceptably priced broadband (~256kbit) so the distant *'s will have<BR> > propper connections.<BR> ><BR> > My question:<BR> ><BR> > Is 128kbit a wide enough connection for 1 simultaneous conversation, using <BR> > IAX protocol with the comercial version of the g729 codec?<BR> ><BR> > I'm expecting this to be engough for more then 1 conversation (after all a<BR> > single line analog connection is rated at 64kbit and I'm getting double that <BR> > bandwidth)<BR> ><BR> > Cosmin Prund<BR> ><BR> ><BR> > _______________________________________________<BR> > --Bandwidth and Colocation provided by <A href="http://Easynews.com">Easynews.com</A> --<BR> ><BR> > Asterisk-Users mailing list<BR> > To UNSUBSCRIBE or update options visit:<BR> > <A href="http://lists.digium.com/mailman/listinfo/asterisk-users">http://lists.digium.com/mailman/listinfo/asterisk-users </A><BR> > From - Wed<BR> ><BR> <BR> --<BR> Garth van Sittert<BR> BSc (Physics & Computer Science)<BR> -----------------<BR> Mobile: +27 (0)83 791 6662<BR> Email: <A href="mailto:garth@bitco.co.za">garth@bitco.co.za</A> <BR> Phone: 08600 BITCO<BR> Web: <A href="http://www.bitco.co.za">www.bitco.co.za</A><BR> <BR> _______________________________________________<BR> --Bandwidth and Colocation provided by <A href="http://Easynews.com">Easynews.com </A>--<BR> <BR> Asterisk-Users mailing list<BR> To UNSUBSCRIBE or update options visit:<BR> <A href="http://lists.digium.com/mailman/listinfo/asterisk-users">http://lists.digium.com/mailman/listinfo/asterisk-users</A><O:P></O:P></SPAN></FONT></P> </DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt"><O:P> </O:P></SPAN></FONT></P> </DIV> </DIV> </O:SMARTTAGTYPE><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">--Bandwidth and Colocation provided by Easynews.com --</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Asterisk-Users mailing list</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">To UNSUBSCRIBE or update options visit:</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN><A href="http://lists.digium.com/mailman/listinfo/asterisk-users">http://lists.digium.com/mailman/listinfo/asterisk-users</A></DIV> </BLOCKQUOTE></DIV><BR><DIV> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica"><A href="http://www.westhawk.co.uk">http://www.westhawk.co.uk</A>/</FONT></P> </DIV><BR></BODY></HTML>