CCIE Collaboration Flashcards

Which Cisco platform serves as the primary call processing engine in a Cisco Unified Communications deployment?

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.

What protocol does Cisco Unified IP Phones primarily use to register with CUCM in modern deployments?

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).

In Cisco UC, what is the function of a Route Pattern?

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.

Which codec provides toll-quality voice at 64 kbps and is used as the baseline for voice quality in PSTN?

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.

What is the purpose of Cisco Expressway in a UC deployment?

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.

In SIP, which message type is used to initiate a call session?

Answer: INVITE

The SIP INVITE message initiates a call session by requesting the establishment of a media session with the called party.