<div dir="ltr">Hello Scott,<br><br>Thank you for your kind support.<br><br>All your ideas are helpful.<br><br>I will check the OpenVPN solution first. then, I will see if Skype and IAX may help.<br><br>Best Regards.<br><br>
Abdelkader Mosbah.<br><br style="color: rgb(0, 153, 0);"><div style="" id=":19f" class="t5"><span style="display: none;" id=":19m">♫ </span><span id=":19n"><b><span style="color: rgb(0, 153, 0);">Please
discover scientific miracles of CORAN:</span></b>
<br><a href="http://www.55a.net/">http://www.55a.net/</a></span></div><br><br><div class="gmail_quote">On Sun, Feb 14, 2010 at 2:57 PM, Scott L. Lykens <span dir="ltr"><<a href="mailto:slykens@verimedservices.com">slykens@verimedservices.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div link="blue" vlink="purple" lang="EN-US"><div><p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Mosbah –</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p><p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">I apologize that I only have limited help to offer. I do not work with user agents other than hard phones in my regular course of business. In the case of aggressive blocking I use Cisco VPN hardware to encrypt the traffic. This is probably not a solution for you as it will add $100-$300 per location to your set up cost. (Plus your central VPN hardware cost) Best case money-wise here would be to use OpenVPN and OpenWRT on Linksys hardware but you’re still talking about extra hardware and $100 per location.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p><p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Perhaps you could pay for someone to integrate an OpenVPN client with a softphone? Set up the client so that it tries regular SIP and if it fails it then establishes a VPN to you using OpenVPN to pass the SIP traffic.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p><p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Another option that comes to mind that may have the potential to do as you desire would be an encrypted IAX softphone. As you know, IAX is a simple UDP protocol and with “registration” enabled should pass through most firewalls properly. You may have to make multiple ports available for use in case udp/4569 is outright blocked. Using simple encryption may be sufficient to overcome DPI by aggressive ISPs and governments.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p><p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">I am sure there are many papers available on how Skype manages to work in many unfavorable network situations and would recommend them as a start to understanding the whys and hows.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p><p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Best wishes.</span></p><p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">sl</span></p><p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p><p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div style="border-width: medium medium medium 1.5pt; border-style: none none none solid; border-color: -moz-use-text-color -moz-use-text-color -moz-use-text-color blue; padding: 0in 0in 0in 4pt;"><div><div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> mosbah.abdelkader [mailto:<a href="mailto:mosbah.abdelkader@gmail.com" target="_blank">mosbah.abdelkader@gmail.com</a>] <br>
<b>Sent:</b> Sunday, February 14, 2010 7:37 AM<br><b>To:</b> Scott L. Lykens<br><b>Cc:</b> asterisk-users<br><b>Subject:</b> RE: SIP tunnel</span></p></div></div><div><div></div><div class="h5"><p class="MsoNormal"> </p><div>
<p class="MsoNormal">Hello Scott,<br><br>First, I want to thank you for your good help.<br><br>I need to handle all the failure situations of voip calls. Sometimes, the source of failure are the ISP and the government theirselves who inspects traffic with powerful firewalls and sometimes the problem comes from the client who does not have a sufficient knowledge to allow voip traffic in his network.<br>
<br>For all that reasons, I need to implement a generic user agent to have it working after its launch in all the situations..<br clear="all"><br>-- <br>Please discover scientific miracles of CORAN<br><br><a href="http://www.55a.net/" target="_blank">http://www.55a.net/</a></p>
</div></div></div></div></div></div></blockquote></div><br><br clear="all"><br>-- <br>Please discover scientific miracles of CORAN<br><br><a href="http://www.55a.net/">http://www.55a.net/</a><br>
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