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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>Dear Mr. Shuvro,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>You can ask your SP to ensure the following requirements for good voice quality.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><span style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>Packet <b>Loss</b> should be no more than <b>1%</b> between source and destination <o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><span style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>One-way <b>Latency</b> (mouth-to-ear) should be no more than <b>150</b> ms<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><span style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>Average one-way <b>Jitter</b> should be targeted under <b>30</b> ms<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>If you use Ethernet connection and G.729 at 50 pps with 20 ms sampling rate, you need at least 37 kbps bandwidth for each call. Please correct me if I am wrong.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>Palash<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>BOL<o:p></o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Suvra Dev Kar [mailto:eng.suvra@gmail.com] <br><b>Sent:</b> Monday, November 18, 2013 3:51 PM<br><b>To:</b> Md Zahidul Haque<br><b>Cc:</b> Jahangir Hossain; Palash Kanti Barua; nog@bdnog.org<br><b>Subject:</b> Re: [bdNOG] Call Center Voice quality improve in public internet and call center security<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><div><div><div><div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Dear Team Member,<o:p></o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'>Thanks For your Suggestion. I know voice quality can not improve using any firewall. firewall and voice quality is both are different. i saw if network any firewall have which is create problem for voice termination. but firewall is important to secure the network. i want to know any device which can support voice termination. <o:p></o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'>and for voice quality issue i am not interest to get IPLC, without IPLC how i can get good voice quality from public internet in Bangladesh. any one have any Band width which can defer voice traffic and data traffic when it is going through any pipe link. coz voice traffic will be priority in public internet, how i can do this, or who can give this type of service.,<br><br><o:p></o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'>and thanks to roman bhai, that for voice termination workshop agenda,. It is very important for Bangladesh.<o:p></o:p></p></div><div><p class=MsoNormal>FOr routing we are using Tier 1 provider. for compression we are using 20 ms payload size for g729 call.<br><br><br> <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>Best Regards<o:p></o:p></p></div><p class=MsoNormal>Suvro<o:p></o:p></p></div><p class=MsoNormal>Helloworld Communication Ltd.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On Mon, Nov 18, 2013 at 11:35 AM, Md Zahidul Haque <<a href="mailto:zahid@zhaque.net" target="_blank">zahid@zhaque.net</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Palash vai is absolutely right. </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>There are lots of other factor like BW, Compression mechanism, routing mechanism etc. that can cause the poor quality of voice.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Zahidul Haque</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>HRC IGW</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a href="mailto:nog-bounces@bdnog.org" target="_blank">nog-bounces@bdnog.org</a> [mailto:<a href="mailto:nog-bounces@bdnog.org" target="_blank">nog-bounces@bdnog.org</a>] <b>On Behalf Of </b>Jahangir Hossain<br><b>Sent:</b> Monday, November 18, 2013 11:13 AM<br><b>To:</b> Palash Kanti Barua<br><b>Cc:</b> <a href="mailto:nog@bdnog.org" target="_blank">nog@bdnog.org</a><br><b>Subject:</b> Re: [bdNOG] Call Center Voice quality improve in public internet and call center security</span><o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-family:"Tahoma","sans-serif"'>1+ palash bhai.</span><o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><br><br><br><o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-family:"Tahoma","sans-serif"'>Regards // Jahangir Hossain</span><o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-family:"Tahoma","sans-serif"'> Open Communication</span><o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On Mon, Nov 18, 2013 at 11:08 AM, Palash Kanti Barua <<a href="mailto:palash@bol-online.com" target="_blank">palash@bol-online.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Dear Mr. Suvro,<br><br>Your voice traffic is passing from source to destination and vice versa<br>using different carriers' network. So, it would be really difficult to<br>ensure End-to-End voice quality over the Internet. No one will guarantee for<br>it. Still IPLC is the best solution for it though it is quite costly. There<br>is one alternative solution is to get international MPLS connectivity if any<br>SP can provide you the same in BD. As far as I know, there is no firewall<br>device or software which can improve the voice quality over the internet.<br><br>Regards,<br>Palash Kanti Barua<br>BOL<o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><br>-----Original Message-----<br>From: <a href="mailto:nog-bounces@bdnog.org" target="_blank">nog-bounces@bdnog.org</a> [mailto:<a href="mailto:nog-bounces@bdnog.org" target="_blank">nog-bounces@bdnog.org</a>] On Behalf Of<br>Suvra Dev Kar<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>Sent: Monday, November 18, 2013 12:41 AM<br>To: <a href="mailto:nog@bdnog.org" target="_blank">nog@bdnog.org</a><br>Subject: [bdNOG] Call Center Voice quality improve in public internet and<br>call center security<o:p></o:p></p></div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Dear BD nog Team member,<br><br><br>I am suvro from Hello world communications ltd. we are international<br>call center, we are using voice termination through public internet,<br>maximum time we face voice quality issue. Now can you tel me any one<br>how i can get good voice quality from public internet. we are not<br>using IPLC coz its costly. and tel me for call center and voice<br>termination which firewall device or software i can use.<br><br><br>Best Regards<br>Suvro Dev<br>Hello world communications Ltd<br>cell- <a href="tel:%2B8801745724242" target="_blank">+8801745724242</a>.<br>_______________________________________________<br>nog mailing list<br><a href="mailto:nog@bdnog.org" target="_blank">nog@bdnog.org</a><br><a href="http://mailman.bdnog.org/mailman/listinfo/nog" target="_blank">http://mailman.bdnog.org/mailman/listinfo/nog</a><br><br>_______________________________________________<br>nog mailing list<br><a href="mailto:nog@bdnog.org" target="_blank">nog@bdnog.org</a><br><a href="http://mailman.bdnog.org/mailman/listinfo/nog" target="_blank">http://mailman.bdnog.org/mailman/listinfo/nog</a><o:p></o:p></p></div></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><br><br clear=all><br>-- <o:p></o:p></p><div><div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-family:"Tahoma","sans-serif"'> </span><o:p></o:p></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> <o:p></o:p></p></div></div></div></div></div></div></div></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><br>_______________________________________________<br>nog mailing list<br><a href="mailto:nog@bdnog.org">nog@bdnog.org</a><br><a href="http://mailman.bdnog.org/mailman/listinfo/nog" target="_blank">http://mailman.bdnog.org/mailman/listinfo/nog</a><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>