Category Archive: VoIP

Jan 02 2018

Why your game console or home VoIP PBX won’t work with OPNsense or pfSense, and how to fix it

If you have been using a standard router and decide to upgrade to OPNsense or pfSense (I personally recommend OPNsense, solely because of the heavy-handed moderation in the pfSense user forum, where a user can apparently get banned for life for even a small inadvertent infraction), you may find that making a game console or …

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Dec 22 2017

A Bash script to rewrite the "static" IP address in the FreePBX Asterisk SIP Settings when it is changed by your ISP

This post is going to be a bit long because I first need to explain the “why” behind this script, then the script itself and how to test it after installation. Please note that the screenshots below are from earlier versions of FreePBX, and you probably will be using a more modern GUI interface, but …

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Sep 17 2016

OAuth 2.0 Support for Asterisk 13, so XMPP connections to Google Voice can be made using the more secure oAuth authentication

If you are running Asterisk 13 (or are ready to upgrade to Asterisk 13) and are using it to connect to one or more Google Voice accounts, you can now use oAuth authentication instead of the problematic username/password, without resorting to the use of a pre-built distribution that may contain features you don’t need and …

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Sep 07 2016

How to hack the FreePBX blacklist for better call blocking capability, take 2 – adding TrueCNAM scoring

This article is mostly a repeat of the article How to hack the FreePBX blacklist for better call blocking capability, the only difference being that this article adds the ability to use TrueCNAM to help determine if an incoming call is from a telemarketer or robo-caller. It’s not foolproof, of course, and some spam calls …

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May 26 2016

Read this before you pay $10 to Obihai for support

As you may be aware, I removed all of the Obihai-related articles on this blog in protest of Obihai’s decision to attempt to charge users an additional $10 support fee in order to get firmware updates, and I no longer recommend Obihai devices. However, if you previously purchased an Obihai and find that you need …

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Aug 01 2015

Install Elastix Unified Communication Server – Unixmen

Elastix is an unified communications server software that brings together IP PBX, email, IM, faxing and collaboration functionality. Source: Install Elastix Unified Communication Server – Unixmen

Jun 02 2015

Link to forum thread: Obihai sucks – buyers paid for Google Voice, now they want more!

Obihai now wants more money to give you the functionality you originally purchased! This was kind of buried in a previous thread but I thought it deserved its own thread. I have been a supporter of Obihai devices in the past, but no longer! I have an Obihai OBi100 and when I first got it …

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May 26 2015

How to use a custom SIP header to pass the DID (or other data) between two Asterisk servers that jointly handle extensions

If you have multiple Asterisk or FreePBX servers at different locations that pass Intra-Company traffic between each other using SIP trunks, you may have wished for a way to pass the Calling DID number (or some other bit of data stored in an Asterisk variable) from one server to another. For example, let’s suppose that …

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May 24 2015

Link: One Way Audio SIP Fix

The Problem When making audio calls using SIP the phone rings but when it is answered there is only one way audio or no way audio. What Cause One Way Audio The cause of one way audio is a combination of NAT and STUN (which we’ll come onto later). Let’s talk about NAT first. Full …

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May 12 2015

Forum thread: User-specific Caller ID/whitelist/blacklist in Asterisk/FreePBX

Occasionally I see a forum thread that contains enough interesting material that it could be the start of an article, but because it’s stretched through a number of posts, I can only link to the thread. And also, because I’m not the author of any of the original posts, I can’t just copy and paste …

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