A non-Plivo number can be used as the caller ID for outbound calls. Please use the following API:
This attribute acts as the caller ID for the outbound call, Please use a valid phone number as the ‘from’ number which will be displayed as the caller’s number to the call recipient. For more information, please refer to this guide: https://www.plivo.com/docs/api/call/#arguments
You can achieve the results using the PHLO.