Nortel 1000 Fundamentals page 296

296 Appendix B Configuration Examples
If the Telephone Number is normalized to the Line URI format, you can use
the "Click to Call" feature to show the caller's user name when the Address
Book Service is available.
Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007
Copyright © 2005–2008, Nortel Networks
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Nortel Communication Server 1000
NN43001-121 01.03 Standard
Release 5.0 30 April 2008