CCIE CCIE Collaboration 1 — Questions and Answers
Question 1: Which Cisco platform serves as the primary call processing engine in a Cisco Unified Communications deployment?
- Cisco Unity Connection
- Cisco Unified Communications Manager (CUCM) (Correct answer)
- Cisco Expressway
- Cisco Webex Calling
Correct answer: Cisco Unified Communications Manager (CUCM)
Cisco CUCM (CallManager) is the core call processing platform managing call routing, device registration, and dial plan in a UC deployment.
Question 2: What protocol does Cisco Unified IP Phones primarily use to register with CUCM in modern deployments?
- H.323
- MGCP
- SCCP (Skinny)
- SIP (Correct answer)
Correct answer: SIP
Modern Cisco IP phones use SIP for registration and call signaling with CUCM, though legacy phones may still use SCCP (Skinny Client Control Protocol).
Question 3: In Cisco UC, what is the function of a Route Pattern?
- Defining codec preferences
- Matching dialed digits and determining call routing actions (Correct answer)
- Configuring voicemail integration
- Managing phone firmware
Correct answer: Matching dialed digits and determining call routing actions
Route Patterns in CUCM match dialed digit strings and define how calls are routed, including which route list or gateway to use.
Question 4: Which codec provides toll-quality voice at 64 kbps and is used as the baseline for voice quality in PSTN?
- G.729
- G.711 (Correct answer)
- G.722
- Opus
Correct answer: G.711
G.711 uses PCM at 64 kbps and provides toll-quality voice, serving as the baseline codec for PSTN and high-quality VoIP connections.
Question 5: What is the purpose of Cisco Expressway in a UC deployment?
- Internal call processing
- Firewall traversal for SIP/H.323 calls and Mobile Remote Access (MRA) (Correct answer)
- Voicemail storage
- Conference bridge
Correct answer: Firewall traversal for SIP/H.323 calls and Mobile Remote Access (MRA)
Cisco Expressway-E/C provides secure firewall traversal for B2B calls and Mobile Remote Access (MRA), enabling endpoints outside the enterprise to register to CUCM.
Question 6: In SIP, which message type is used to initiate a call session?
- REGISTER
- OPTIONS
- INVITE (Correct answer)
- SUBSCRIBE
Correct answer: INVITE
The SIP INVITE message initiates a call session by requesting the establishment of a media session with the called party.
CCIE CCIE Collaboration 1
Which Cisco platform serves as the primary call processing engine in a Cisco Unified Communications deployment?