Sony IT-B5 Operating Instructions Manual page 7

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If the line is busy when you call someone,
or you want to call again someone you
just called, there is no need to dial the
number again manuaily. The REDIAL/
PAUSE button automatically redials the
most recently dialed number.
Press (REDIAL/PAUSE: instead of dialing
the number.
You can redial a phone number of up to
31 digits.