The CSS on a line includes the partitions 911, internal and local. The CSS on the device includes the partitions 911, internal, local and long distance. Which CSS will be used if the phone user…

Question

Options

• AThe device CSS will be used since the device CSS is always used first on an IP phone.
• BSince the dialed digits are a match to a partition is in both Calling Search Spaces the call will use
• CIf there is both a line and device CSS the line device will only be used.
• DThe line and device CSSs will be combined and the device CSS will take precedence.
• EThe line and device CSSs will be combined and the line CSS will take precedence.

• A
  15% (5)
• B
  3% (1)
• C
  6% (2)
• D
  3% (1)
• E
  74% (25)

Explanation

In CUCM, when an IP phone has both a Line CSS and a Device CSS configured, the two CSSs are merged into a single, ordered search list. The partitions from the Line CSS are placed first (highest priority), followed by the partitions from the Device CSS. Since the 'local' partition exists in both CSSs, the match will be found via the Line CSS first. The Line CSS always takes precedence over the Device CSS in the combined search order, which allows per-line calling privileges to override or supplement device-level privileges.

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