Polycom TransTalk 9000-Series - Manual (Page 337)

Recall Timer Duration (#107)
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3. Select another procedure or exit programming mode.
4. If you are using Recall to access PBX or Centrex features, test the new
Recall Timer setting:
■ If a call is disconnected, shorten the time.
■
If the Recall signal has no effect, lengthen the time.