There are many factors that influence Voice over IP (VoIP). Generally speaking, VoIP is sensitive to packet loss...
and latency so you need to provide sufficient bandwidth for the number of VoIP connections that you will be using. Also, a good ISP helps. As for your VPN, it depends on the type of VPN technology that you are using. If you use a VPN with your VoIP solution, you must account for extra bandwidth due to packet overhead. I have seen tests that state that Secure Socket Layer (SSL) VPNs actually improve VoIP quality due to Transmission Control Protocol (TCP) encapsulation. Besides throwing bandwidth at the problem, treating VoIP traffic with a certain quality of service (QoS) is recommended and will help your VoIP quality. For an Internet Protocol Security (IPsec) VPN that means the client should be able to identify VoIP traffic and prioritize it accordingly.
For more information, view our VoIP over WAN tutorial.
Email your VPN-related questions to firstname.lastname@example.org.
Dig Deeper on VPN design
Related Q&A from Rainer Enders
Administrators don't have to worry about interoperability; integrated mobile application and device management is the best approach.continue reading
Ensuring that the client software itself is up to date is just one of many reasons why it's critical to oversee VPN clients.continue reading
To ensure mobile device security, VPN expert Rainer Enders explains that it is crucial to monitor changed states and block software modifications.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.