device_name,mac_address,sip_user,sip_password,assign_to
poly123,48:25:67:07:A2:85,user_12345,p@ssw0rd,user_email@talkdesk.com
yealink123,,user_12345,ssw0rd,
snom123,48:25:67:07:A2:85,,,
polycom3456,,,,