[Okta Webinar] Learn how to a build a cloud-first strategyRegister Now


VoIP behind PF firewall

Posted on 2004-11-09
Medium Priority
Last Modified: 2012-05-05
Hello all!

I have VoIP device D-Link DVG-1104TH and I dont have additional IP adress.
So I want to place this device behind firewall PF (OpenBSD).
Can I Do this? Is PF support H.323 protocol?

Question by:sergey_qw
  • 2

Accepted Solution

darcone earned 200 total points
ID: 12563382
Whenever you are in this kind of situation, regardless of the type of device - you can use NAT (Network addres translation). Basically, you use a router to use the same IP address for several seperate devices without them being aware of it - and forward needed ports from the router to the devices. I.e. you have a LAN o one side of the router, and the internet on the other side. Computers on the LAN can have IP addresses {, ...} and you tell the router to forward all packets that arrive to port 1076 to a certain IP, that implements a service that uses the port (some kind of server). Hope this helps.

Expert Comment

ID: 12563397
Btw that may not be what you asked for, read your question again and realized I answered something a bit different :) However, the answer to your question would be quite alike, and you will probably need to do both what I previously said, and place the firewall before the router. Then you will have solved the no-IP problem, and only have left to allow incoming and outgoing VoIP packets, which may be possible on the basis of type of packets (VoIP) or may not, unfortunately I am not so very good at firewalls but I suspect that if there is no support for that specific packet format, you may be able to implement it by some sort of plugin or module.

Featured Post


Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In my office we had 10 Cisco 7940G IP phones that were useless as they were showing PROTOCOL APPLICATION INVALID when started. I searched through Google and worked for a week continuously on those phones, and finally got them working. This is a di…
Every year the snow affects people and businesses. According to the Federation of Small Businesses (FSB), in 2009, UK businesses lost an estimated £1.2bn (http://news.bbc.co.uk/1/hi/business/7864804.stm) because of bad weather. This article was c…
Is your data getting by on basic protection measures? In today’s climate of debilitating malware and ransomware—like WannaCry—that may not be enough. You need to establish more than basics, like a recovery plan that protects both data and endpoints.…
Whether it be Exchange Server Crash Issues, Dirty Shutdown Errors or Failed to mount error, Stellar Phoenix Mailbox Exchange Recovery has always got your back. With the help of its easy to understand user interface and 3 simple steps recovery proced…
Suggested Courses
Course of the Month19 days, 9 hours left to enroll

873 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question