On older V5R2 and previous systems, you can modify the data area QESTELE
for the phone numbers. Each number uses 50 positions. Now if you have
to dial 9 to get out first, pre-append with 9: (colon).
One of my older systems is set as:
Value *...+....1....+....2....+....3....+....4....+....5 '9:18003270949 ' '9:18005278207 ' ' ' ' '