On the site of the module author you have detailed step-by-step instructions on how to install it.

You can download the module from the OpenERP Apps site. Then install it using bazaar.

In case the link is broken here is a copy/paste from the site:

The OpenERP-Asterisk connector is made of 2 modules :

• asterisk_click2dial : this is the main module, that everybody should install. This module has been fully developped by Akretion.

• asteriskclick2dialcrm : an additionnal module that you should install only if you are interested in the additionnal CRM-specific features. This module has initially been developped by the Spanish company Zikzakmedia and later enhanced by Akretion.

These modules should be installed on OpenERP just like any OpenERP module. The source code of the module is available on the dedicated project OpenERP-Asterisk connector on Launchpad :

• for OpenERP v5/v6 (same code for these 2 versions of OpenERP) : https://code.launchpad.net/~openerp-asterisk-team/openerp-asterisk-connector/6.0

• for OpenERP v6.1 : https://code.launchpad.net/~openerp-asterisk-team/openerp-asterisk-connector/6.1

The version of OpenERP 6.1 is currently the main focus of development ; some features are only available in this version.

These modules require two additional Python libraries : phonenumbers and py-Asterisk. To install the library phonenumbers, run:

% sudo pip install phonenumbers

The pip command is the successor of easy_install and is the official tool to install Python libraries. If you don't have this tool on your system, install the corresponding package (package python-pip on Debian/Ubuntu systems).

To install the library py-Asterisk, you can't use the pip install command because you need a very recent version which is not yet in Pypi. In fact, you need to have this commit which is dated November 20th, 2012. So you should get the source from the project py-asterisk on Google code :

% hg clone https://code.google.com/p/py-asterisk/
% cd py-asterisk
% sudo python ./setup.py install

The hg command is part of the Mercurial version control system. If you don't have this tool on your system, install the corresponding package (package mercurial on Debian/Ubuntu systems).

Note : the module named asterisk in the extra-addons repository is not related to this connector. The asterisk_click2dial module doesn’t depend on it.