Oki MB492dn User Manual page 421

Using a One-touch Button
You can select an e-mail address that is registered to the speed dial list with a one-touch button.
Memo
Specify a destination in step 5 in
To select the speed dial numbers 09 to 40 that are assigned to one-touch buttons, press
Topics
Sending an Internet Fax
Specifying a destination in other methods
Using Direct Entry
Selecting from the Address Book or Group List
Selecting from the Transmission History
Specify a Destination by Searching the LDAP Server
"Sending an Internet Fax".
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or to switch between the screens.