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If the caller is already a contact, the pop-up will show his Contact Details page.
The Agent can add and update the data (also the created Custom Fields) and see the Contact Call History.
Phonebar API integration
You can let you Agents to call CM contacts, using the XCALLY Phonebar, just clicking on the phone number as shown below:
The Agent can perform a Call or a Blind Transfer
To enable this feature, please go under Agents Settings -> xCally Phonebar tab and set Enable CM dial button as Yes.