Importing and updating contacts
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To automate the import and update of contacts from one application to another.
Emails, SMS and voice messages
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To automate the sending of messages between Digitaleo and your application.
Popular ways to use 
Synchronize your contacts
Example: update a contact in Hubspot when the latter clicks in an email sent with Digitaleo.
Automate your SMS, emails and voicemail messages
Example: send a voice message to a lead with Digitaleo when the latter reaches a sufficiently high score in Hubspot.