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Cisco Unified Communications Manager Administration Guide
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SIP Realm Configuration
When you configure digest authentication for SIP trunks, Cisco Unified Communications Manager
challenges the identity of the SIP user agent that connects to the trunk every time the trunk sends a SIP
request to Cisco Unified Communications Manager; the SIP user agent, in turn, can challenge the
identity of Cisco Unified Communications Manager. For Cisco Unified Communications Manager to
respond to a challenge from the SIP user agent, you must configure the SIP realm for Cisco Unified
Communications Manager.
For information on how to configure SIP realm for Cisco Unified Communications Manager, refer to the
Cisco Unified Communications Manager Security Guide.