You need to identify the Lync Server 2013 features to employ in order to optimize the quality of audio calls in the Beijing office, even during heavy network load. Which three features should you employ? (Each correct answer presents part of the solution. Choose three.)
A. call Admission Control (CAC)
B. Mediation Server bypass
C. call Detail Recording (CDR)
D. Quality of Service (QoS)
E. Quality of Experience (QoE)
Correct Answer: ABD
Explanation/Reference:
A: Real-time communications are sensitive to the latency and packet loss that can occur on congested networks. Call admission control (CAC) determines, based on available network bandwidth, whether to allow real-time communications sessions such as voice or video calls to be established. The CAC design in Lync Server 2013 offers four main attributes:
It is simple to deploy and manage without requiring additional equipment, such as specially configured routers.
It addresses critical unified communications use cases, such as roaming users and multiple points of presence. CAC policies are enforced according to where the endpoint is located, not where the user is homed.
In addition to voice calls, it can be applied to other traffic, such as video calls and audio/video conferencing sessions.
Provides the flexibility to enable representation of various kinds of network topologies.
B: In Microsoft Lync Server, we recommend that you configure voice traffic to bypass the Mediation Server when possible. Doing so helps improve call quality by optimizing the media path, reducing latency, minimizing unnecessary transcoding, limiting packet loss, and eliminating potential points of failure.
Mediation Server bypass also provides you bandwidth savings in configurations where a Mediation Server and a PSTN gateway or PBX are at different sites connected by WAN links, especially if bandwidth over the link is limited. Offloading the media processing from the Mediation Server also improves scalability.
D: Quality of Service (QoS) is a networking technology used in some organizations to help provide an optimal end-user experience for audio and video communications. QoS is most- commonly used on networks where bandwidth is limited: with a large number of network packets competing for a relatively small amount of available bandwidth, Quality of Service provides a way for administrators to assign higher priorities to packets carrying audio or video data. By giving these packets a higher priority, audio and video communications are likely to complete faster, and with less interruption, than network sessions involving things like file transfers, web browsing, or database backups. That’s because network packets used for file transfers or database backups are assigned a “best effort” priority.
Incorrect:
Not C: Call detail recording (CDR) records usage and diagnostic information about peer-to-peer activities including instance messaging, Voice over Internet Protocol (VoIP) calls, application sharing, file transfer, and meetings. The usage data can be used to calculate return on investment (ROI) and the diagnostic data can be used to troubleshoot peer-to-peer activities and meetings.
Explanation/Reference:
A: Real-time communications are sensitive to the latency and packet loss that can occur on congested networks. Call admission control (CAC) determines, based on available network bandwidth, whether to allow real-time communications sessions such as voice or video calls to be established. The CAC design in Lync Server 2013 offers four main attributes:
It is simple to deploy and manage without requiring additional equipment, such as specially configured routers.
It addresses critical unified communications use cases, such as roaming users and multiple points of presence. CAC policies are enforced according to where the endpoint is located, not where the user is homed.
In addition to voice calls, it can be applied to other traffic, such as video calls and audio/video conferencing sessions.
Provides the flexibility to enable representation of various kinds of network topologies.
B: In Microsoft Lync Server, we recommend that you configure voice traffic to bypass the Mediation Server when possible. Doing so helps improve call quality by optimizing the media path, reducing latency, minimizing unnecessary transcoding, limiting packet loss, and eliminating potential points of failure.
Mediation Server bypass also provides you bandwidth savings in configurations where a Mediation Server and a PSTN gateway or PBX are at different sites connected by WAN links, especially if bandwidth over the link is limited. Offloading the media processing from the Mediation Server also improves scalability.
D: Quality of Service (QoS) is a networking technology used in some organizations to help provide an optimal end-user experience for audio and video communications. QoS is most- commonly used on networks where bandwidth is limited: with a large number of network packets competing for a relatively small amount of available bandwidth, Quality of Service provides a way for administrators to assign higher priorities to packets carrying audio or video data. By giving these packets a higher priority, audio and video communications are likely to complete faster, and with less interruption, than network sessions involving things like file transfers, web browsing, or database backups. That’s because network packets used for file transfers or database backups are assigned a “best effort” priority.
Incorrect:
Not C: Call detail recording (CDR) records usage and diagnostic information about peer-to-peer activities including instance messaging, Voice over Internet Protocol (VoIP) calls, application sharing, file transfer, and meetings. The usage data can be used to calculate return on investment (ROI) and the diagnostic data can be used to troubleshoot peer-to-peer activities and meetings.
