I'm not sure about trunks in Maldives, but hopefully this is what you need, and that your trunks support it.
In the DID Ranges for CPN Substitution form, create a range such as.
Index DID Range CPN Substitution
1 202,302,402,502 123456202 (replace 123456202 with your desired DID to show)
Then in the CPN Substitution form, add the DID Ranges Index from above as a member to the appropriate trunk/s.