Polycom VVX C Business Media Phone for Cisco Unified Communications Manager (SIP) - Manual (Page 13)

Configuring Cisco Unified Communications Manager
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4. Select Third-party SIP Device (Advanced) and click Next.
5. In the Name text box, enter a profile name appropriate for the system.
6. Select the Enabled Digest Authentication check box.
7. Click the Save button.
In the status bar near the top of the page, “Update Successful” appears.