Importing and updating contacts
by 
To automate the import and update of contacts from one application to another.
Emails, SMS and voice messages
by
To automate the sending of messages between Digitaleo and your application.
What you can do with 
Synchronise your contacts unilaterally
For example: create a new contact in Digitaleo when a new customer is added in QuickBooks Online.
Automate your SMS, emails and voicemails
For example: send an email to a customer using Digitaleo when a new invoice is generated in QuickBooks Online.