Ricoh Aficio MP 161F - Searching by Fax Number

Registering Addresses and Users for Facsimile/Scanner Functions
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Searching by Fax Number
Search the address book using registered fax numbers.
A Press [Search].
B Select [Search Fax Destination] using {U} or {T}, and then press the {OK} key.
C Enter the fax number you want to search for using the number keys, and
then press the {OK} key.
To search by IP-Fax number, press [IP], enter the IP-Fax number, and then
press the {OK} key.
D Press the {OK} key.
The search results appear.
E Select the name using {U} or {T}, then confirm it by pressing {V}, and then
press the {OK} key.
Reference
"Entering Text", About This Machine