Hello Scott, Thank you for your kind support.
All your ideas are helpful. I will check the OpenVPN solution first. then, I will see if Skype and IAX may help. Best Regards. Abdelkader Mosbah. ♫ *Please discover scientific miracles of CORAN:* http://www.55a.net/ On Sun, Feb 14, 2010 at 2:57 PM, Scott L. Lykens < [email protected]> wrote: > Mosbah – > > > > 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. > > > > 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. > > > > 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. > > > > 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. > > > > Best wishes. > > > > sl > > > > > > *From:* mosbah.abdelkader [mailto:[email protected]] > *Sent:* Sunday, February 14, 2010 7:37 AM > *To:* Scott L. Lykens > *Cc:* asterisk-users > *Subject:* RE: SIP tunnel > > > > Hello Scott, > > First, I want to thank you for your good help. > > 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. > > For all that reasons, I need to implement a generic user agent to have it > working after its launch in all the situations.. > > -- > Please discover scientific miracles of CORAN > > http://www.55a.net/ > -- Please discover scientific miracles of CORAN http://www.55a.net/
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