Odoo-telephony-connector ( OCA ):

http://www.akretion.com/open-source-contributions/openerp-asterisk-voip-connector

Oficial Asterisk Wiki:

https://wiki.asterisk.org/wiki/display/AST/Installing+Asterisk

Install Asterisk

https://www.odoo.com/documentation/user/9.0//crm/leads/voip/setup.html