Ansible role for asterisk install.

Note:
Requires such variables present in calling playbook:
[name]:           [default]
data_dir:         /data
source_dir:       "{{data_dir}}/source"
cache_dir:        "{{data_dir}}/cache"

asterisk_user:    asteriskbpx
asterisk_group:   asteriskbpx

asterisk_db_name
asterisk_db_user
asterisk_db_pass
asterisk_db_host
asterisk_db_port