Polycom RealPresence RMX 1500 Administrator's Manual page 341

Address Book
3 Select the (Custom) option from the drop-down list.
The Custom Filtering dialog box opens.
4 In the Condition - Column text matches field, enter the filtering pattern.
For example, to list only endpoints that include the numerals 41 in their name, enter 41.
5 To add filtering patterns to further filter the list or fine tune your search, click Add Condition.
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