Below are links to documentation from both Sysadminman and other sources on the web
FreePBX
- Getting started with FreePBX – Part 1 Setting up a trunk
- Getting started with FreePBX – Part 2 Setting up an extension
- Getting started with FreePBX – Part 3 Making external calls
- Getting started with FreePBX – Part 4 Setting up a DID number
- Getting started with FreePBX – Part 5 Setting up an IVR
- Getting started with FreePBX – Part 6 Cheap phone calls using DISA and Callback
- Conferences with Asterisk and FreePBX
- Using a callwithus DID with FreePBX/Asterisk
- Blacklist a caller with FreePBX
- Routing a call based on time of day with FreePBX
- FreePBX HowTo's
- CallCentric trunk setup
- Setting up a LinkSys SPA-941 in FreePBX
- Using a CallWithUs DID number with FreePBX
- Configuring a UK Sipgate trunk
A2Billing
- Getting started with A2Billing – Part 1 Setting up a trunk
- Getting started with A2Billing – Part 2 Ratecards and Call Plans
- Getting started with A2Billing – Part 3 Creating an access DID
- Getting started with A2Billing – Part 4 Creating a customer and making a call
- Getting started with A2Billing – Part 5 Importing a ratecard
- Integrating FreePBX with A2Billing
- Automatically create A2Billing rate card from callwithus rate file
Are you looking for more in-depth training or support for A2Billing?
Then I can recommend contacting Star2Billing, the commercial arm of A2Billing, who provide training, configuration and support.
Elastix
Asterisk
- Calculating bandwidth requirements for calls
- Hacking and securing your Asterisk server
- Free O'Reilly book