Which top-level IOS command is needed to begin the configuration of a Cisco Unified Communications Manager Express gateway to enable phones to be registered via SIP?

Question

Options

• Aallow-connections sip to sip
• Bvoice service sip
• Cvoice register global
• Dvoice register dn

• A
  5% (3)
• B
  3% (2)
• C
  2% (1)
• D
  91% (60)

Explanation

Note: There appears to be an error in the provided answer key. The actual correct answer is C (voice register global), not D.

voice register global is the top-level IOS command that initiates SIP phone registration configuration in Cisco CME. Entering this mode is required before CME can accept SIP phone registrations - it's where you define global parameters like max-dn (maximum directory numbers) and max-pool (maximum SIP phone pools).

Why the distractors are wrong:

• A (allow-connections sip to sip) - This is a sub-command entered under voice service voip mode; it controls SIP-to-SIP call routing, not phone registration.
• B (voice service sip) - Not a valid standalone IOS command; the correct form is voice service voip, which configures VoIP service globally but doesn't directly enable SIP phone registration in CME.
• D (voice register dn) - This command configures individual directory numbers after the global SIP framework is already established; it cannot "begin" the registration process.

Memory tip: Think of it as building a house - voice register global lays the foundation for all SIP phones; voice register dn and voice register pool are the rooms built on top of it. You always start with the global foundation.

If this question appeared on an official practice exam, the answer key likely contains a typo swapping C and D.

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