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Voip Technology

Subject : it-skills
Instructions:
  • Answer 49 questions in 15 minutes.
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  • Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A cost-saving benefit that results from organizations completing long-distance telephone calls over their packet-switched networks - thus bypassing tolls charged by common carriers on comparable PSTN calls.






2. A type of phone that includes a screen and can decode compressed video and interpret transport and signaling protocols necesary for conducting videoconference session.






3. As specified in RFC 2205 - a QoS technique that attempts to reserve a specific amount of network resources for a transmission before the transmission occurs.






4. A protocol used between media gateway controllers and media gateways. MEGACO is poised to replace MGCP on modern converged networks - as it supports a broader range of network technologies - including ATM. Also known as H.248.






5. A session layer control protocol defined as part of ITU's H.323 multiservice network architecture. H.245 is responsible for controlling a session betwenn two nodes. For example - it ensures that the two nodes are communicating in the same format.






6. A collection of H.323 terminals - gateways - and MCU's that are managed by a single H.323 gatekeeper.






7. The real-time reception and transmission of images and audio among two or more locations.






8. A gateway capable of accepting connections from multiple devices (for example - IP telephones - traditional telephones - IP fax machines - traditional fax machines - and so on) and translating analog signals into packetized - digital signals - and vi






9. In SIP terminology - any client - server - or gateway communicating on the network.






10. A service that transmits faxes over TCP/IP network.






11. A service in which television signals from broadcast or cable networks travel over packet-switched networks.






12. In the DiffServ QoS technique - a forwarding specification that assigns each data stream a minimum departure rate from a given node. This technique circimvents delays that slow normal data from reaching its destination on time and in sequence. EF inf






13. A computer that manages multiple media gateways and facilitates the exchange of call control information between these gateways.






14. A protocol suite codified by the IETF (in RFC 2543) as a set of Session layer signaling and control protocols for multiservice - packet-based networks. With few exceptions - SIP performs much the same functions as the H.323 signaling protocols perfor






15. On a network following the H.323 standard - a gateway that provides translation between network devices running H.323 signaling protocols and devices running other types of signaling protocols (for example - SS7 on te PSTN).






16. On a SIP network - a server that accepts requests for location information from user agents - then queries the nearest registrar server on behalf of those user agents. If the recipient user agent is in the SIP proxy server's domain - then that server






17. A computer configured to act like an IP telephone. Softphones present the caller with a graphical representation of a telephone dial pad and can connect to a network via a LAN - WAN - PPP dial-up connection - or leased lined.






18. The centralized management of multiple types of network-based communications - such as voice - video - fax - and messaging services.






19. A service in which video signals are compressed and delivered over the Internet in a continuous stream so that a user can watch and listen even before all the data has been transmitted.






20. A gateway that can translate IP fax data into analog fax data and vice versa. A fax gateway can also emulate and interpret conventional fax signaling protocols when communicating with a conventional fax machine.






21. In SIP terminology - a user agent client or user agent server.






22. The provision of telephone service over the Internet.






23. A telephone used for VoIP on a TCP/IP-based network. IP telephones are designed to transmit and receive only digital signals.






24. The nerve center for networks that adhere to H.323. Gatekeepers authorize and authenticate terminals and gateways - manage bandwidth - and oversee call routing - accounting - and billing. Gatekeepers are optional on H.323 networks.






25. The provision of telephone service over a packet-switched network running the TCP/IP protocol suite.






26. A protocol used for communication between media gateway controllers and media gateways. MGCP is defined in RFC 2507 but it was never officially adopted as a standard. MGCP is currently the most popular media gateway control protocol used on converged






27. A service in which a video is stored as an encoded file is delivered to a viewer upon his request.






28. A compter that provides support for multiple H.323 terminals (for example - serveral workstations participating in a videoconference) and manages communication between then. An MCU is also known as a video bridge.






29. A streaming video - either on demand or live - that is delivered via the Web.






30. A companion protocol to RTP - defined in RFC 3550 by the IETF - RTCP provides feedback on the quality of a call or videoconference to its participants.






31. On a SIP network - a server that maintains a database containing information about the locations (network addresses) of each user agent in its domain. When the user agent joins a SIP network - it transmits its location information to the SIP registra






32. A service that uses the ATM network access method (and ATM cells) to transmit voice signals over a network.






33. In SIP terminology - a server that responds to user agent clients' requests for session initiation and termination.






34. A service that relies on a DSL connection to transmit packetized voice signals.






35. On a SIP network - a server that accepts and responds to requests from user agents and SIP proxy servers for location information on recipients that belong to external domains.






36. A transport layer protocol used with voice and video transmission. RTP operates on top of UDP and provides information about packet sequenceto help receiving nodes detect delay and packet loss. It also assigns packets a timestamp that corresponds to






37. Any type of video service - including IPTV - videoconferencing - and streaming video - that delivers video signals over packet-switched networks using the TCP/IP protocol suite.






38. A private switch that accepts and interprets both analog and digital voice signals (although some IP-PBXs do not accept analog lines). It can connect with both traditional PSTN lines and data networks. An IP-PBX transmits and receives IP-based voice






39. An ITU standard that describes an architecture and a suite of protocols for establishing and managing multimedia services sessions on a packet-switched network.






40. In the DiffServ QoS technique - a forwarding specification that allows routers to assign data streams one of several prioritization levels. AF is specified in the DiffServ field in an IPv4 datagram.






41. On a network following the H.323 standard - any node that provides audio - visual - or data information to another node.






42. In the context of IPTV - a device that decodes digital video signals and issues them to the television. Set top boxes also communicate with content servers to manage video delivery.






43. A set of standards established b the ITU for handling call signaling on the PSTN (public switch telephone network).






44. An interal or externally attached adapter that converts analog telephone signals into packet-switched voice signals and vice-versa.






45. A telephone switch used to connect calls within a provate organization.






46. The exchange of information between the components of a network or system for the purposes of establishing - monitoring - or releasing connections as well as controlling system operations.






47. A session layer call signaling protocol defined as part of ITU's H.323 multiservice network architecture. H.225 is responsible for call or videoconference setup between nodes on a VoIP or video-over-IP network - indicating node status - requesting ad






48. In SIP terminology - end-user devices such as workstations - PDAs - cell phones - or IP telephones. A user agent client initiates a SIP connection.






49. A technique for ensuring QoS by prioritizing traffic. DiffServ places information in the DiffServ field in an IPv4 datagram. In IPv6 datagrams - DiffServ uses a similar field known as the Traffic Class field. The information indicates to the network







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