946| Voice and Video AOS-W 6.5.3.x| User Guide
Microsoft Lync/Skype for Business uses SIP over TLS for call signaling.
AOS-W provides value added services such as prioritization of Lync/Skype for Business sessions, call quality
metrics, and visibility by implementing Lync/Skype for Business Application Layer Gateway (ALG). This solution
also provides a dedicated visibility and troubleshooting framework that allows network administrators to fine-
tune and troubleshoot Lync/Skype for Business traffic flow in the network.
As Microsoft Lync/Skype for Business deployments are more widely implemented on wireless networks, it is
important to provide Quality of Service (QoS) for Lync/Skype for Business voice or video calls, desktop sharing,
and file transfer so that there is no visible difference in the user experience between wireless and wired
networks. Lync/Skype for Business ALG offers an enriched solution in terms of QoS, scalable voice, video,
desktop-sharing, and file-transfer. The ALG based solution provides the following value-added services:
n Call Quality Metrics: Call quality details such as Mean Opinion Score (MOS), delay, jitter, and packet loss.
n Call Priority: Call priority is provided for all Lync/Skype for Business sessions irrespective of Call Admission
Control (CAC)limit. Starting from AOS-W 6.4.x, Lync/Skype for Business sessions are prioritized based on
session-specific requirements. Voice calls get highest priority, followed by video and desktop sharing. File-
transfer gets the least priority.
n Call and Client information: Details about Lync/Skype for Business call types and statistics through CLI.
The commands are discussed later in this section.
n Deterministic Solution: A dedicated visibility and troubleshooting framework that allows network
administrators to fine-tune and troubleshoot Lync/Skype for Business traffic flow in the network. This
solution provides an enriched performance which uses Deep Packet Inspection (DPI).
n Call Admission Control: Starting from AOS-W 6.4.x, Lync/Skype for Business sessions do not come under
the purview of call count based CAC and bandwidth based CAC. For more information, see Changes to Call
Admission Control on page 963.
To take advantage of AOS-W 6.4.x UCC Lync/Skype for Business ALG, it is recommended to use the Microsoft
Lync/Skype for Business SDN Interface. AOS-W supports all versions of Lync SDN Interface up to version 2.4.1.
Microsoft Lync/Skype for Business SDN Interface works with Microsoft Lync/Skype for Business server to
export details about voice or video calls, desktop-sharing, and file-transfer to Alcatel-Lucent switch’s Web
server. The communication between the Lync/Skype for Business SDN Interface and Web server occurs over
HTTP or HTTPS.
This section includes the following sub-sections:
n Lync/Skype for Business ALG Compatibility Matrix on page 947
n Configuration Prerequisites on page 947
n Skype For Business SDN Interface 2.4.1 Support on page 947
n Skype For Business SDN Interface 2.2 Support on page 947
n Lync SDN API 2.1 Support on page 947
n Lync/Skype for Business SDN Interface - AOS-W Compatibility Matrix on page 948
n Configuring Lync/Skype for Business ALG on page 948
n Viewing Lync/Skype for Business ALG Statistics using the CLI
n Unified Communication and Collaboration on page 945
n Troubleshooting Lync/Skype for Business ALG Issues on page 953
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