User's Manual

Microsoft Lync uses SIP over TLS for call signaling.
ArubaOS provides value added services such as prioritization of Lync sessions, call quality metrics, and visibility
by implementing Lync Application Layer Gateway (ALG). This solution also provides a dedicated visibility and
troubleshooting framework that allows network administrators to fine-tune and troubleshoot Lync traffic flow
in the network.
As Microsoft Lync deployments are more widely implemented on wireless networks, it is important to provide
Quality of Service (QoS) for Lync 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 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:
l Call Quality Metrics: Call quality details such as Mean Opinion Score (MOS), delay, jitter, and packet loss.
l Call Priority: Call priority is provided for all Lync sessions irrespective of Call Admission Control (CAC)limit.
In ArubaOS 6.4, Lync 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.
l Call and Client information: Details about Lync call types and statistics through CLI. The commands are
discussed later in this section.
l Deterministic Solution: A dedicated visibility and troubleshooting framework that allows network
administrators to fine-tune and troubleshoot Lync traffic flow in the network. This solution provides an
enriched performance which uses Deep Packet Inspection (DPI).
l Call Admission Control: In ArubaOS 6.4, Lync 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 914.
To take advantage of ArubaOS 6.4 UCC Lync ALG, it is recommended to use the Microsoft Lync SDN API.
ArubaOS 6.4 supports all versions of Lync SDN API up to version 2.0. Microsoft Lync SDN API works with
Microsoft Lync server to export details about voice or video calls, desktop-sharing, and file-transfer to Dell
controller’s Web server. The communication between the Lync SDN API and Web server occurs over HTTP or
HTTPS.
This section includes the following sub-sections:
l Lync ALG Compatibility Matrix on page 900
l Configuration Prerequisites on page 901
l Configuring Lync ALG on page 901
l Viewing Lync ALG Statistics using the CLI
l Viewing Lync ALG Statistics Using the WebUI on page 906
l Troubleshooting Lync ALG Issues on page 907
Lync ALG Compatibility Matrix
The following table lists the Lync clients that support voice, video, desktop sharing, and file transfer
applications in ArubaOS 6.4:
Dell Networking W-Series ArubaOS 6.4.x | User Guide Voice and Video | 900