Exam 11: Voice and Video Over IP

The popular Internet telephony software,Skype,is a type of ____.

All VoIP calls are carried over the Internet.

When VoIP relies on the Internet,it is often called ____.

MATCHING Match each item with a statement below: a.H.323 terminal f.H.225 b.H.323 gateway g.H.245 c.H.323 gatekeeper h.RTP d.MCU (multipoint control unit) i.RSVP e.H.323 zone -Any node that provides audio,visual,or data information to another node.

When using an analog telephone,a VoIP adapter that performs analog-to-digital conversion is known as a(n)____.

MATCHING Match each item with a statement below: a.H.323 terminal f.H.225 b.H.323 gateway g.H.245 c.H.323 gatekeeper h.RTP d.MCU (multipoint control unit) i.RSVP e.H.323 zone -A collection of H.323 terminals,gateways,and MCUs that are managed by a single H.323 gatekeeper.

When a caller uses an IP telephone,his or her voice is immediately digitized and issued from the telephone to the network in ____ form.

Describe the RTCP (Real-time Transport Control Protocol),defined in RFC 3550 by the IETF.

Explain why UDP is preferred over TCP for real-time applications such as telephone conversations and videoconferences.

It is more difficult to transmit VoIP and video over IP signals over a packet-switched network than it is to transmit data signals.

In general,a(n)____ is a private switch that accepts and interprets both analog and digital voice signals.

____ is preferred over TCP for real-time applications such as telephone conversations and videoconferencing.

Describe five features unique to IP telephones.

MATCHING Match each item with a statement below: a.H.323 terminal f.H.225 b.H.323 gateway g.H.245 c.H.323 gatekeeper h.RTP d.MCU (multipoint control unit) i.RSVP e.H.323 zone -Helps voice and video networks overcome UDP's shortcomings.

A computer programmed to act like an IP telephone is known as a(n)____.

One drawback to ____ video is that content may not be edited before it's distributed.

When more than two people participate in a videoconference,for example,in a point-to-multipoint or multipoint-to-multipoint scenario,a video ____ is required.

Besides being extremely mobile,describe another advantage to softphones.

MATCHING Match each item with a statement below: a.H.323 terminal f.H.225 b.H.323 gateway g.H.245 c.H.323 gatekeeper h.RTP d.MCU (multipoint control unit) i.RSVP e.H.323 zone -A device providing translation between network devices running H.323 signaling protocols and devices running other types of signaling protocols.

An off-the-shelf workstation can be programmed to act like an IP telephone.