Inbound calls not working

Inbound calls from a landline is working perfect but inbound calls from a cell phone are getting an error.
(“SIP/Local-00000086”, “__FROM_DID=XXXXXX3020;npdi=yes”)

How do I get the calls to go through when npdi is flagged as yes?

Ask the person who wrote the dialplan, or provide ALL the relevant parts of the dialplan.