Hey Benson, do you want to set caller ID during call forwarding? if so you can do it using transfer call function which can be of either of customer number or phone number.
curl -X POST
\\
-H "Authorization: Bearer " \\
-H "Content-Type: application/json" \\
-d '{
"type": "transferCall",
"destinations": \[
{
"type": "number",
"number": "insert-phone-number-id-here",
"callerId": "{{customer.number}}",
"numberE164CheckEnabled": false
}
\]
}'