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21 Cards in this Set

  • Front
  • Back
- Name 5 benefits of packet telephony versus circuit-switched telephony

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- More efficient use of bandwidth and equipment;
- Lower cost for telephony network transmission;
- Consolidated voice and data network expenses;
- Increased revenues from new services;
- Access to new communications devices;


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- What does the call control allow users to do?

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- Call control allows users to establish, maintain, and disconnect a voice flow across a network.

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- What are the 3 basic components of call control?
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- Call setup; Routing and admission control
- Call maintenance; Monitor quality of the call
- Call teardown; Release of Resources


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- What is the CAC – Call Admission Control?

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- CAC is used to determine if sufficient bandwidth is available to support the call.

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- What is distributed call control?

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- It’s where the call control is handled by multiple components in the network.

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- Distributed call control enable the gateway to perform 5 procedures. What are they?

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- Recognize the request for service
- Process dialed digits
- Route the call
- Supervise the call
- Terminate the call


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- In the centralized call control scenario, what device handles the call functions?
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- Call Agent

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- Name a protocol that is an example of a centralized call control model?

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- MGCP

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- What does the Gatekeeper do?

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- Provide CAC – call admission control,
- Bandwidth control and management,
- And address translation.

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- What is the function of the Gateway?

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- Provides translation between VoIP and non-VoIP networks, such as the PSTN

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- Good voice quality depends on what?

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- On the capacity of the network to deliver voice with guaranteed delay and timing.

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- Name 2 protocols that are examples of distributed call control?

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- H.323
- SIP


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- In the centralized call control model, signaling is performed by which components?

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- Call Agent.

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- Component of a Packet voice network responsible to translate between the IP network and the PSTN?

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- Gateway

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- Component of a Packet voice network responsible to provide access for end users who wants to participate in videoconferencing.

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- Videoconference station.

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- Component of a Packet voice network responsible to brings IP voice to the desktop

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- IP phone

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- Component of a Packet voice network responsible to provide real-time connectivity for videoconferencing.

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- MCU – Multipoint control unit.

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- Component of a Packet voice network responsible to provides services such as voice mail and unified messaging

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- Application server

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- Component of a Packet voice network responsible to performs call control on behalf of IP phones

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- Call agent

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- Name 2 features required by real-times traffic

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- Low delay
- Consistent timing.


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- Traditional data networks were designed with what characteristic?

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- Best-effort packet delivery.

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