The community's VoIP FAQ contains this post here:
Jan 30, 2012 Question: Can I use a central Phone book or is LDAP / Corporate Directory supported?
Resolution: Please check => here <=
The above has an example configuration file that you can use as a template.
Any XML errors in your file and the phone will not process it. You can simply use an XML Editor like XML Notepad 2007 to verify your configuration.
Please ensure you always check the community FAQ and/or utilize the community search before posting any new topics or follow up post’s.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
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Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge.
Please also ensure you always check the VoIP , Video Endpoint , Microsoft Voice , PSTN or other FAQ's in the different sections