Overview and Introduction
I’ve been dabbling with managing a VOIP server for the past year or so, using CentOS, Asterisk and FreePBX on a co-located server. Recently Dave and I needed to move to our own machine, and decided to use TEH CLOUD to reduce management and get a fresh start. There are hundreds of hosts out there offering virtual private servers (VPS’s). We’ve standardized on Linode for our small business for a few reasons. While I don’t want to sound like a complete advertisement, I’ve been incredibly impressed with them:
- Performance. The host systems at Linode run at least 4-way 2GHz Xeon dual-core CPUs (I’ve seen higher as well) and you’re guaranteed the RAM you pay for. Pricing is generally based on how much memory you need.
- Pricing. For a 512MB Linode, you pay $19.95 US per month. Slicehost (a part of Rackspace, and a Linode competitor) charges the same amount for a 256MB slice. Generally you want at least 512MB RAM for a Linux machine that’s not a test/development box.
- Features. If you have multiple VMs in the same datacenter, you can assign them private IPs and internal traffic doesn’t count toward your bandwidth allowance. Likewise, bandwidth is pooled among all your VMs; so buying two VMs with 200GB bandwidth each gives 400GB for all your systems.
With full root access and the Linux distribution of your choice, it’s very easy to set up and tear down VMs.
When people hear VOIP, they generally assume either a flaky enterprise system with echoing calls or something like Skype. Properly configured, a VOIP system offers a number of really interesting features:
- Low-cost long distance and international calling. The provider we use, voip.ms, offers outgoing calls for $0.0052 per minute to Canada and $0.0105/minute to the US on their value route.
- Cheap phone numbers – direct inward dialing – are available for $0.99 per month in your region. These phone numbers are virtual and can be configured to do nearly anything you want. Incoming calls are $0.01/minute, and calls between voip.ms numbers are free.
- Want to take advantage of cheap long distance from your cell phone? Set up a Direct Inward System Access path, which gives you a dial tone for making outgoing calls when you call a local number. Put your DID number on your My5 list, and you’re set to reduce bill overages.
- Voicemail becomes much more useful when the VOIP server sends you an email with a WAV attachment and caller ID information.
- Want to set up an interactive voice response menu, time conditions, blacklist telemarketers, manage group conferences or have witty hold music? All available with FreePBX and Asterisk.
Continue reading for server setup details and security best practices…