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Wiki HomeAccording to a study by Sirrix VPN has no negative influence on latency, jitter and packet loss; in the case of the g7.11 codec and compressed VPN it is even possible to gain 10% bandwidth compared to non-VPN traffic. Apart from that, different common VPN solutions have big difference on the available throughput, which is due to the rather small packet sizes and greatly increased overhead:
With enabling authentication, encryption, HMAC, anti-replay attack, and initialization vector, and use small RTP size for Codec, the vpn overhead is high:
g723 with 30ms RTP size and using VPN tunneling: approx. 85% overhead;
g729a with 20ms RTP size and using VPN tunneling: approx. 80% overhead;
But when making some adjustments on the encryption/authentication settings and double the RTP size, the overhead can go down to about 20%-30%, which is affordable for most of cases.
Comparing to SRTP as encryption method for VoIP: approx. 5% additional overhead.
VoIP and VPN Forums:
Some Articles discussing this:
- Network World - Test shows VoIP call quality can improve with SSL VPN links
- O'Reilly Emerging Telephony Strangely, SSL VPNs can help VoIP call quality
- VoIP News Net - VoIP Security via VPN - how to do it yourself.
Some commercial services providing VPN tunneling for VoIP traffic
- VPN4VOIP.COM - VPN for VOIP is a low cost SSL based VPN service specially designed for VOIP applications. It helps to bypass ISP blocking on VOIP calls utilizing the VPN tunneling technology and assigns mapped static public IP to VOIP gateways for wholesale traffic origination and termination applications. The service is QoS controlled, secure, flexible and reliable. It is claimed to be working 100% with any ISP - Only one open UDP port is needed to get the solution works. You can use their free deployed client software under Windows XP/2003 with two Ethernet cards which changes the PC into a soft VPN router, or just purchase their affordable standalone VPN4VOIP router. Client side can use any dynamic or private IP connections to use the service.
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Anonymous VPN
There are many reasons and cases where VPN can be used.
The first one – you can use VPN to hide your real IP address and become anonymous online. The second - you can use VOIP VPN!
Another reason to use VPN is when you need to download some files from the other network which bans IP addresses from your country. Using anonymous VPN surfing you can get an access to those data.
One more important reason to use VPN is a necessity to code your traffic.
In all the cases if you use VPN you will have a dedicated IP address from the other network and all your traffic will be sent between your computer and VPN server in a coded view that exclude incursion and analys of your data.
If you use one of the WI-FI networks (these are public and usually free networks) we strongly recommend you to use VPN to save your personal information that can be easy intercepted in the WI-FI networks.
Full security can be reached only if you strictly follow the rules of using you operational system.
VPN guarantes 128-bit data coding. Talking about anonymity we can say with certainty that this idea is comparative.
Laws in many countries (Germany, USA, China, etc.) forbid Internet users to download mp3 and video from the net.
VPN allows you to surf anonymous without any restrictions. Also with VPN you can prevent interception of the data which you send to your friends, partners and other people.
Anonymous VPN give you an access to the information that was forbidden for you because of your race, some political rules, your country laws, etc.
New Release for VoIP Anti-Blocking solutions
VG Plugin software for Windows operation system,
VGSC software for Windows Operation system,
VGBC hardware for terminal side
VG SPE Gateways for terminal side.
Please contact me for more information. Thank you.
Andy Wong
Email: Xd.wong@speed-voip.com
MSN: andywong-01@hotmail.com
VPN and VGCP -- for VoIP Blocking issue
In today’s market, VoIP for business has become more and more popular and necessary than ever before.
Dubai has become a big market, many big companies need to open branch offices in the UAE allowing more profit and larger market access. Technology Issues become apparent during this process that can cripple communications for that company. The primary communications issues are with VOIP blocking policies implemented in Dubai.
Now, here is the good news, A Canada based company SpeedVoIP with their integral R&D team have work out a new way to solve this VoIP blocking issue. This new system VGCP (VoiceGuard@ Control Protocol) has now laid the path to streamline low cost telephony solutions removing country limitations.
VGCP is a proprietary layer 2 link protocol working at between IP stack and NIC driver for VoIP anti-blocking. The core patent-pending VGCP is industry's most state-of-art voice service provider class security protocol whose scalability and flexibility results in not to compromise voice quality and overhead. VGCP controls and monitors full voice signalling and media flow intelligently, meanwhile disguises sip and RTP packets into normal allowed data packets such as DNS and TFTP, and makes two-way encryption and decryption driven by user-customized policy. VGCP is fully transparent to upper SIP proxy or UA which means VoiceGuard@ can work with any 3rd party soft phone/ATA/Gateway/IP Phone/IADs and SIP Proxy or Server not like some competitors which take effect on their own device and soft switch.
Korea Telecom has implemented this solution successfully for more than one year. And it has been operational within a group of Dubai companies. The trials and implementations proves that, The VGCP solution is the best solution to solve the VoIP Blocking issue and provides stable communications platforms providing an indispensable part of the business network.
Andy Wong ~ ~
MSN: andywong-01@hotmail.com
Email: xd.wong@speed-voip.com
www.speed-voip.com