100-890 · Question #53
Which two features are provided by the Cisco Unified Communications Manager signaling and device control function? (Choose two )
The correct answer is C. call tear-down D. call setup. Signaling and device control: CUCM sets up all the signaling connections between call endpoints and directs devices such as phones, gateways, and conference bridges to establish and tear down streaming connections. Signaling is also referred to as call control and call setup/call
Question
Which two features are provided by the Cisco Unified Communications Manager signaling and device control function? (Choose two )
Options
- Aquick dialing
- Bphone book service
- Ccall tear-down
- Dcall setup
- Etransmission of audio/video media between endpoints
How the community answered
(63 responses)- A17% (11)
- B5% (3)
- C71% (45)
- E6% (4)
Explanation
Signaling and device control: CUCM sets up all the signaling connections between call endpoints and directs devices such as phones, gateways, and conference bridges to establish and tear down streaming connections. Signaling is also referred to as call control and call setup/call
Topics
Community Discussion
8
Viktor S.Oct 23, 2025C and D are correct. The signaling and device control function in CUCM is responsible for establishing and terminating calls, which is exactly what call setup and call tear-down mean. The other options trip people up because CUCM does not transmit audio or video media between endpoints, that travels directly between the endpoints themselves via RTP, and quick dialing or phone book features are application-layer services, not part of the core signaling function.
Toby R.Oct 26, 2025Solid breakdown, though worth adding that CUCM also handles mid-call signaling like hold and transfer, not just setup and tear-down, so the signaling role is broader than the question implies.
Bao N.Oct 16, 2025I got this one wrong my first time through because I almost locked in A and D, thinking "quick dialing" sounded like something CUCM handles directly since it manages the dial plan. What snapped me out of it was remembering that signaling and device control is specifically about the call lifecycle, meaning how a call gets established and how it gets torn down, which points straight to C and D. Option E tripped up a lot of people in my study group too, but actual audio and video media travels directly between endpoints over RTP, CUCM never touches that stream, it only controls the signaling path. Once you draw that line between the signaling plane and the media plane, C and D become the obvious pick and everything else falls off.
Viktor S.Oct 18, 2025Bao got the core right, but "quick dialing" tripping people up is worth unpacking because speed dial is a feature of the phone firmware and directory config, not dial plan routing, so it was never CUCM's signaling engine to begin with.
Sam P.Nov 6, 2025The phrase "signaling and device control" is doing a lot of work here and I can see why E trips people up, because yes, UCM is absolutely involved when audio and video flows between endpoints, but that involvement is indirect. UCM handles the signaling plane, meaning it uses protocols like SCCP or SIP to tell phones what to do, and "what to do" means setting up the call (D) and tearing it down (C). The actual RTP media stream, the audio and video bits themselves, travel directly between endpoints peer-to-peer and UCM mostly stays out of that path after the call is established. A and B are things you might associate with a self-service IP phone feature like Extension Mobility or the Cisco IP Phone Services framework, not the core signaling engine. So the test is really asking you to separate the control plane (UCM's job) from the media plane (the endpoints' job), and once you think about it that way, C and D are the only ones that make sense.
Prof. SaraOct 7, 2025C and D are exactly right, signaling and device control in CUCM owns the call lifecycle, meaning it handles call setup and call tear-down through protocols like SCCP or SIP, while the actual audio and video media travels directly between endpoints on its own path, which is why E is out of scope for this function.
Viktor S.Oct 8, 2025Call control handling setup and teardown is the core of it, but worth noting that CUCM can also influence the media path indirectly through features like MTP insertion or transcoding when codec mismatches force it to get involved.
Toby R.Oct 28, 2025The wording "signaling and device control" does the heavy lifting here, because signaling is literally what sets up and tears down calls, so C and D are the obvious picks. E trips people up because CUCM does not actually carry the media stream, it just tells the endpoints where to send it, which is a classic distinction they love to test on this exam.