The providers template from Twilio needs to be modified in order for the trunk to show the correct Caller ID.
For this, navigate your Admin options > Voice & Chat in order to find the current entry of your provider. Then, go to the right side of the entry, click the 3 dots icon and click on 'Export'. Open it with Notepad ++. Then, change the following field:
from :
<field name="ParameterIn" custom="" parameter="FromUserPart">$CallerName</field>
<field name="ParameterIn" custom="" parameter="FromUserPart">$CallerName</field>

To:
<field name="ParameterIn" custom="" parameter="FromDisplayName">$CallerName</field>
<field name="ParameterIn" custom="" parameter="FromDisplayName">$CallerName</field>
Once you have the modified template, you will need to navigate your Admin options > Advanced > Templates > Provider Templates, and click the import provider option. Select and upload the modified template, and configure your provider accordingly.
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