Question

How to setup VOIP using VPN

Asked by: westdata

Hi Experts!

I have been thinking to setup VPN servers across the world at locations including USA, UK, Germany, Canada.

Then, I would like to setup VOIP system using my VPN setup.


Can anyone guide me what further infrastructure I would need to setup VOIP using VPN? I would love to avoid hardware as much as I can. I will prefer soft solutions :)

May be this could give you a rough picture of what I am looking to implement:

http://www.strongvpn.com/voip.shtml




Thankyou very much in advance!

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Asked On
2009-03-28 at 08:53:36ID24273834
Tags

VOIP

,

VPN

,

IPSec

,

Encryption

Topics

Voice Over IP

,

Virtual Private Networking (VPN)

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: Roachy1979Posted on 2009-03-30 at 03:41:48ID: 24017517

Can I just clarify?

You would like to use softphones on client machines connected to a VoIP pbx through a VPN?

Personally, I'd look at a combination of OpenVPN and Asterisk to deliver this.  My OS of choice to do this would be linux, but there this can be achieved using Windows just as well.

You would need to set up the Asterisk at your parent site (the site where the clients connect in to).  You would then set up a linux firewall running OpenVPN at the gateway.  The remote clients would have OpenVPN clients and certs installed and would connect using a softphone such as Ekiga.  Remote VoIP traffic would be router to a provider unencrypted to your chosen SIP/IAX provider.  In the UK we have telepliant who natively support IAX (the Asterisk VoIP protocol, that is IMHO inherantly better than SIP).

The beauty of this solution is that the software is all FOSS - free of charge however you choose to use it.  The downside is that there is a learning curve (you would need to understand Asterisk, how VoIP works and understand routing pretty well).  This can be simplified by using an Asterisk solution such as Trixbox and by using a free appliance firewall such as pfSense....

Have a look at the following links:

http://www.trixbox.org

http://www.asterisk.org/

http://openvpn.net/

http://www.pfsense.com/

http://www.gnomemeeting.org/

 

by: westdataPosted on 2009-03-31 at 04:12:33ID: 24027529

Thank you very much for your detailed response, I understand the solution you gave. However, I was thinking about a setup like that in the picture I have attached. Please have your look.

I am thinking to get a dedicated 2 MB line here locally, connect to a SIP server (Locally or at remote location, which one you'd recommend?) Then my clients in Middle East would dial my VPN server, and relayed to the SIP device that will complete the connection.

Regarding the solution you have recommended, I have read and experience degraded QoS and ACD when using OpenVPN. The PPTP/L2TP would work fine....

P.S : I am not really a network literate, just know a few things by experience.....bear with me

  • 3.JPG
    • 49 KB

    The VPN for Voip structure

    The VPN for Voip structure
 

by: Roachy1979Posted on 2009-04-01 at 04:19:01ID: 24037880

Ok....the best way to achieve this largely depends on the volume of "internal" calls as to whether you use an internal or external host, and also how comfortable you are with troubleshooting VoIP issues (which can involve packet capture and analysis).  Remember - if you host your own VoIP server then if there were problems with calls between your extensions would need to be able to troubleshoot yourself....

If you have a high number of internal calls then the way forward is probably to host your own SIP server (which in turn connects to a 3rd party server to connect externally to the PSTN network).  Otherwise you would be kicking the traffic out of the internal network to a 3rd party to then have the calls routed back in - which would double your bandwidth requirement for those calls.  But again this depends on your desire/ability to support it....

Does this help at all...?  No problem with not being "network literate" - looks to me like you're doing pretty well :)  And after all - that's what EE is for :)


20120131-EE-VQP-002

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