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Voip Technology
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Voip Technology
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25 Questions

1. 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.

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

3. 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

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

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

6. 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.

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

8. 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.

9. 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.

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

11. 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.

12. 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

13. 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

14. 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.

15. 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

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

17. 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

18. The provision of telephone service over the Internet.

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

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

21. 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

22. 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.

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

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

25. 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

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