Call me button for Address Book

Configuration

Set parameters using defaults:

defaults write com.apple.AddressBook AsteriskManagerHost -string asterisk.example.com
defaults write com.apple.AddressBook AsteriskManagerPort -int 5038
defaults write com.apple.AddressBook AsteriskManagerUsername -string yourusername
defaults write com.apple.AddressBook AsteriskManagerPassword -string yourpassword
defaults write com.apple.AddressBook AsteriskOriginateChannel -string "SIP/yourphone"
defaults write com.apple.AddressBook AsteriskOriginateContext -string "from-internal"

Installation

Build callme.bundle, then copy it to ~/Library/Address\ Book\ Plug-Ins.