AG Projects is providing a pretty nice CLI based Open Source SIP phone to the world. The installation instructions can be a confusing mess.
Here’s a short summary on how to install it on a clean, brand new Debian Lenny installation. Details are correct at time of writing ;-)
First import the AG-Projects key into apt so we know the packages can be trusted.
wget http://download.ag-projects.com/agp-debian-gpg.key
apt-key add agp-debian-gpg.key
Then open the file /etc/apt/sources.list and change al mention of “lenny” into “sid”. Also add the following to the end of the file:
# AG Projects software
deb http://ag-projects.com/debian unstable main
deb-src http://ag-projects.com/debian unstable main
Then it’s time to upgrade to sid
apt-get update
apt-get dist-upgrade
And finally it’s time to install SIP Simple
apt-get update
apt-get install python-sipsimple sipsimple-cli
Officially, this is not the way to install the SIP SIMPLE client on Debian Lenny; it’s the way to upgrade Lenny to unstable (sid), and then install the sipsimple client. If you installed sid instead of lenny, it’d have worked immediatly from the part where you add the ag-projects repository to your sources.list.