Instruction & Research of Internet Services|info@rzfeeser.com
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    SIP response codes – Difference between ’603 Decline’ and ’486 Busy Here’

SIP response codes – Difference between ’603 Decline’ and ’486 Busy Here’

I’ve had several students ask me while lecturing on SIP response codes, “What is the difference between a SIP response ’603 Decline’ and a SIP response ’486 Busy Here’? When is it appropriate to send a 6xx response, and when is it appropriate to send a 4xx response?”

In short, all 6xx responses will terminate SIP dialog and any pending searches, whereas a 486 response would indicate that the user is not available at a particular request-URI.

I’ve constructed a video that demonstrates the difference between these two responses. It might even answer a few questions you didn’t even know you […]

By |October 17th, 2014|Blog, Video|0 Comments
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    How to search and replace or remove lines with REGEX in Notepad++

How to search and replace or remove lines with REGEX in Notepad++

Notepad++ is a practical text editor that is used by many Computer Science & IT professionals. You can download Notepad++ here.

I had a student that asked how to remove ‘commented’ lines from an Avaya configuration file (46xxsettings.txt) using a Regular Expression (REGEX), and Notepad++ (that is to say, delete any lines that began with a # character). I thought this was a practical enough trick to post on my blog, as you can tweak this simple REGEX string to remove, or modify, any lines from any text file you might be interested in manipulating.

1) Open the file you wish […]

By |August 27th, 2014|Blog|0 Comments
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    How to flash Asus RT-AC66R or Asus RT-AC66U with DD-WRT open source

How to flash Asus RT-AC66R or Asus RT-AC66U with DD-WRT open source

I returned from running a two week long SIP training event in Calgary to find my DD-WRT flashed Asus N-16 router had suffered a lightning strike in my absence, and was no longer functional. Not being able to survive without a router, I headed out the Best Buy to find the best DD-WRT capable router (with an AC radio) currently available in a big box store. I ended up with the Asus RT-AC66R (also called the Asus RT-AC66U).

The Asus RT-AC66R (or RT-AC66U) supported by the DDWRT project. Available on Amazon, New Egg & BestBuy. The correct way to […]

By |August 20th, 2014|Blog|0 Comments

SIP RFC 3261 – SIP requests and responses

SIP is an application layer signaling protocol standardized by the IETF in RFC 3261. That word ‘signaling’ means that it is a protocol used to create a kind of ‘control channel’ for an exchange of media (in telephony this is Real-time Transport Protocol or RTP). That’s not to say that we don’t break the rules occasionally, and stuff some text (media) into a SIP MESSAGE, but for the most part, SIP is strictly for control.

SIP messages fall into two categories: requests and responses. SIP requests are identifiable as all CAPS English words (INVITE, ACK, BYE, REFER, INFO, etc.), whereas […]

By |December 30th, 2013|Blog|0 Comments

Interstellaria on Kickstarter

I found what I think looks like a fun indie game titled Interstellaria on Kickstarter, and thought it was worth writing about as I ended up helping fund the game (the campaign was successful on Dec. 6, 2013 $13,805 over it’s $15,000 goal). It is described by the developer Jonathan P. King of Coldrice Games as having, ‘… the spirit of old school space games with modern mechanics”. The graphics have a nostalgic EGA feel, which I like, and without having played the game, it appears to have lots of resource management and strategy elements. I get the feeling it might handle a bit like FTL, […]

By |December 12th, 2013|Blog|0 Comments

Paradise Lost: First Contact on Kickstarter

Paradise Lost: First Contact is a successfully funded Kickstarter campaign; the first title for the Spanish indie developer Asthree Works. Although the Kickstarter campaign has ended, you can still fund the game through Dec. 31, 2013 via the mechanisms described on the official Paradise Lost: First Contact website.

In Paradise Lost: First Contact, you play as an ultra intelligent alien plant attempting to escape from a government research facility. Enough said. Sign me up. After all, who hasn’t laid awake at night wondering what it would be like to live as a photosynthetic alien?

This game has a great retro EGA look; the sprites […]

By |December 5th, 2013|Blog|0 Comments

Hero-U a new game by Corey and Lori Cole

One of my favorite PC gaming publishers of yesterday has always been Sierra- specifically their adventure game ‘Quest’ titles that ran from late 80′s into the 90′s; King’s Quest, Police Quest, Space Quest, and notably the Quest for Glory games (formerly Hero’s Quest until a legal battle with Milton Bradley over their similarly titled board game). Successfully completing any of the titles in the aforementioned series depended on completing puzzles that could only be solved by gaining an intimate knowledge of the game’s story and characters. The majority of these games lacked a speech component, which resulted in this […]

By |November 26th, 2013|Blog|0 Comments

AGD Interactive Studios – Adventure games live again

AGD Interactive Studios is a company devoted to the resurrection of the adventure game genera that was created by Sierra On-Line and wildly popular with PC gamers in late 80′s and 90′s. Their goal is achieved primarily by enhancing and updating old Sierra titles, then offering them for free download. However, AGD has created one original pay-to-play title, Al Emmo: The Lost Dutchman’s Mine, and has another one in the works, Mage’s Initiation: Reign of the Elements.

Mage’s Initiation: Reign of the Elements is the result of a successfully funded Kickstarter campaign (funded March 23, 2013) with the objective to create an […]

By |August 5th, 2013|Blog|0 Comments
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    Setting up Dynamic Domain Name System (DDNS) on a DD-WRT router

Setting up Dynamic Domain Name System (DDNS) on a DD-WRT router

These steps were created using a DD-WRT enabled Asus N-16 router running the firmware “DD-WRT v24-sp2 (12/20/11) mega”.

If you’re unsure what DD-WRT is, then check out the DD-WRT wiki. I won’t claim that it is perfect, but it does provide some fun services you can run on your home LAN to get ‘more’ out of your internet experiences. Essentially, you take a moderately priced router and reflash it with a ‘better’ firmware, resulting in more capabilities. It’s a project that shouldn’t run more than $70. The ASUS N-16 router is a popular choice to flash, as it can […]

By |July 24th, 2013|Blog|0 Comments

How to setup a Minecraft server on Ubuntu 12.04 LTS

There is more than one way to skin a cat. So here is one way to put up a Minecraft server for you and your buddies to play on. This solution assumes you will be hosting the server on your local LAN, and therefore will need to transverse a NAT if you are to make the server available across the WAN (i.e. if you want your buddies to be able to connect to your server from their own LANs).

If you get stuck, feel free to contact me and I’ll help you out. For clarification purposes, the […]

By |July 21st, 2013|Blog|0 Comments