redial
Concise Oxford English Dictionary © 2008 Oxford University Press:
redial/ˈriːdʌɪəl/
▶verb (redials, redialling, redialled; US redials, redialing, redialed) dial (a telephone number) again. ▶noun the facility on a telephone by which the number just dialled may be redialled by pressing a single button.
'redial' also found in these Oxford entries:

