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?
Answer should be B. You have to enable the registrar service before you can provide the address in voice register global
voice service voip
allow-connections sip to sip
!--- Enable SIP to SIP calls.
sip
registrar server expires max 1200 min 300
!--- Enable Cisco IOS SIP registrar.
B and C are both global commands, to use C you need to enter B, but the questions aimes at phone registration, B would be correct basically if the beginn would be a stronger word like first step I assume.
The most voted question is actually B but C is shown as the most voted... strange. The answer is B, because the registrar server command is configured under the voice service voip command. The registrar server command is required to allow the cme to process SIP REGISTER requests.
The correct answer is B:
voice service voip: This is the top-level command used to enter the VoIP configuration mode, where you can configure protocols such as SIP and H.323. From this mode, you set global parameters for SIP, including codec settings, call admission control, and other general VoIP services. This command is necessary to begin configuring the CME gateway for SIP registration.
voice register global: This command is used after entering the VoIP configuration mode (voice service voip) and is specifically for configuring SIP phones in CME. It defines global parameters for SIP registrations, such as the maximum number of phones, system messages, and timers for SIP phones. While this command is essential for SIP phone configuration, it comes after you've initiated VoIP configuration with voice service voip.
Therefore, voice service voip (B) is the top-level command needed to start the SIP configuration, and voice register global (C) is a subsequent step in configuring SIP phone registrations within CME.
Correct answer is B, you have to enter 'voice service voip' to begin to configure CUBE as a registrar server
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