How does Cisco Unified Communications Manager perform a digit analysis on-hook versus off-hook for an outbound call from a Cisco IP phone that is registered to Cisco Unified CM?
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A. B. C. D.C.
When a user initiates an outbound call from a Cisco IP phone registered to Cisco Unified Communications Manager (Unified CM), the digits entered by the user must be analyzed to determine the destination number and route the call accordingly. The process of analyzing these digits is called digit analysis.
The behavior of Unified CM's digit analysis process differs depending on whether the phone is on-hook (not in use) or off-hook (in use).
When the phone is on-hook, Unified CM performs a digit-by-digit analysis. This means that Unified CM analyzes each digit as it is entered and determines whether the call can be routed based on the current set of digits. If the entered digits match a configured dial plan pattern, Unified CM routes the call accordingly. If not, Unified CM waits for additional digits to be entered before making a routing decision.
When the phone is off-hook, Unified CM considers all digits to have been dialed and does not wait for additional digits. This means that Unified CM analyzes all the digits as a complete string rather than a digit-by-digit basis. If the entered digits match a configured dial plan pattern, Unified CM routes the call accordingly. If not, the call is rejected and the user is presented with a fast-busy tone.
Therefore, the correct answer is A: On-hook, Unified CM performs a digit-by-digit analysis; off-hook, Unified CM considers all digits were dialed and does not wait for additional digits.