Answer
Before making changes, print out what you have in case you make a mistake

Required values on the TN

CLS: CFXA - To allow calls to be forwarded externally:

Digital sets need KEY CFW.  Analog sets need FTR CFW.  The user activates CFW from their phone.

NCOS/TGAR: User must be capable of placing the call to where they wish to be Call Forwarded.

Customer Data Block RDR_DATA OPT: Should include CFF (not CFO)

• Print in LD21 REQ PRT TYPE RDR
• Change in LD15 REQ CHG TYPE RDR - at OPT, enter "CFF"

• Route Data Block may need NEDC and FEDC to be "ETH"
• Trunks should be reviewed for SUPN.
• Other values in the RDR_DATA section should be reviewed

If you do not know what trunks or route your call is going over, you're in over your head already.  Seek assistance from of a qualified technician (read as "someone else you can blame") before you attempt any changes.  You may wish to use some of these terms and phrases.

Link to this page: http://www.ghtrout.net/rdr/cfxa.html