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CVOICE CH3 PROTOCOLS

CVOICE CH 3 VOIP OPERATION AND PROTOCOLS

QuestionAnswer
What protocol provides out-of-band data collection for streaming data QoS purposes? RTCP-gives stats for the RTP stream. i.e. count, loss, delay, jitter
Which UDP ports are RTP packets commonly sent on? Even numbered ports between 16384 and 32767
If an RTP stream resides on UDP 20012, what is the most likely UDP port number used by RTCP? 20013
cRTP shrinks which three headers IP, UDP, and RTP
What is the H.323 sub-protocol that specifi es call setup and codec negotiations? H.225
What is the IETF standard protocol that uses a P2P signaling architecture with distributed call control? SIP
In a voice gateway confi gured to use MGCP, where does all of the call-control information reside? At the call processing agent
Which H.323 MCU component is responsible for combining multiple real-time streams from multiple sources into a single stream for transport to recipients? Multipoint processor
What voice functionality monitors destination extensions for new call requests and permits or denies them based on the amount of bandwidth available? Call admission control (CAC)
Which of the following are not information required to be inside a voice IP packet for transport on an IP network? (Choose all that apply.) MAC addresses are found in frames and not packets. Additionally, while QoS information can help to ensure better call quality, it is not required information.
RTP was designed and developed by the IETF to be used with which Layer 4 transport protocol? UDP... RTP was developed to work with UDP because of its small header footprint and lack of retransmission functionality, and cannot be used for transporting real-time traffi c.
How many RTP connections are required for a two-way voice call between IP phones? If two-way communication is needed, two RTP streams must be established.
Which of the following voice gateway signaling protocols uses a centralized call-control model? (Choose all that apply.) A, C. Both MGCP and SCCP keep the call control information on the call-processing agent that centralizes call control.
An RTCP stream has set up a connection on UDP port 1955. What is its companion RTP stream UDP port likely to be? 1954...RTP and RTCP ports are randomly selected between UDP 163854 and 32767. RTP streams are, by default, always even numbered. The RTCP port then will choose the nexthighest odd-numbered port that the RTP port has selected.
You have just implemented voice on your IP network and noticed that some calls properly connected while others were never established. Of the following choices, which one is likely to be the problem? The most likely problem is that a fi rewall has been misconfi gured and is blocking a portion of the UDP ports that a RTP/RTCP session can randomly choose when establishing new connections.
Which of the following RTCP packets contains information about the host device, including CNAME, username, email address, and other data? A. Sender Report B. Source Description C. Application-Specific D. Receiver Report B. The Source Description packet contains various items of descriptive information about the sending voice device that is transmitting an RTP stream.
What size is an uncompressed RTP header? An uncompressed RTP header is 12 bytes and contains 10 fi elds.
name the RTCP packets Goodbye, Source Description, Receiver Report, Sender Report
Created by: papid69
 

 



Voices

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