Sean’s Obsessions

икони цени I’ve wanted to play with the Twilio client for a while. They have this great quick start but it’s written in PHP. Now I don’t mind PHP, but I prefer Ruby. If I’m going to write anything using the client, it’s going to be in Ruby, so I don’t see the point in [...]

иконописI use Nagios to monitor the health of a few servers, and would like to be paged if something goes wrong. When I set it up a couple of years ago, I used SMS Gateway which was $10 for 100 SMSes. I was able to page with a simple curl command. However I’d get the [...]

I’m sitting in a course on call centre design, and yesterday there was mention of Erlangs, which are a unit of measure of the volume of traffic on a telecommunications network. These Erlangs can be used to calculate how many agents a call centre needs (or, given the number of agents, what service level can [...]

I had meant to put these up as .PDFs, but it appears ACM archives LJ articles once they go public (~30 days after the magazine comes out). Enjoy. How to configure SIP and NAT Expose VoIP Problems Using Wireshark

I submitted two articles to Linux Journal in December and I’m happy to see they’re both feature articles in March’s VoIP issue. How to configure SIP and NAT Expose VoIP problems with Wireshark Special thanks to Bill Reid, John Lange, and Les Bester of Les.net for letting me bounce ideas off of them, and again [...]

http://www.crtc.gc.ca/ENG/NEWS/SPEECHES/2006/s060929.htm A local college radio station is being called to task for the following alleged infractions, committed over a year ago. The examination also revealed shortfalls relating to the following three conditions of licence: 1. the licensee broadcast a level of 4.73% category 3 music instead of the weekly minimum of 5%; 2. the licensee [...]

I’ve got ertw.com set up to accept SIP calls, so that if you dial sean@ this domain, it rings a phone here. But, how do you dial out? It’s actually quite easy in theory, since you can Dial() any sort of address, but the trick is to integrate it with the dialplan. A bit of [...]

The topic of ENUM came up last night at the Manitoba Asterisk User’s group meeting. I find the discussion interesting because there are a couple of people there who are involved with the ENUM efforts by CIRA. After discussing the problems and status of ENUM-Canada efforts, I started to wonder, “Do we really need ENUM?”

I wrote an article for O’Reilly’s Emerging Telephony site called Telecom Terms and Concepts. It’s all about how the existing phone system and VoIP works, how they’re the same, and how they’re different. On another voice related note, John Lange has started up the Canadian Association of Voice over IP Providers, a sort of lobby/working [...]

Many sites are reporting that Bell South wants to charge content providers to “to reliably and speedily deliver their content and services.” It’s an interesting thought, with many good arguments for and against. On the surface, it may appear that BS is trying to have their cake and eat it too. People using their network [...]