IT tutorials
 
Applications Server
 

Microsoft Lync Server 2013 : Mediation Server Troubleshooting (part 1)

3/14/2014 4:47:11 AM
- How To Install Windows Server 2012 On VirtualBox
- How To Bypass Torrent Connection Blocking By Your ISP
- How To Install Actual Facebook App On Kindle Fire
Troubleshooting a Mediation Server might become necessary in the event that users are unable to make or receive calls to the PSTN. This section discusses the key components of a Mediation Server to check when issues arise. Common troubleshooting tools and tips are also provided that should resolve many issues.

1. Connectivity to Next-Hop Gateways

Given the Mediation Server’s role of providing PSTN connectivity through a next-hop gateway, ensuring that connectivity to those next-hop services is healthy is important in all troubleshooting scenarios. Lync Server 2013 maintains health monitoring of these connections by default, and it does so in two ways:

SIP OPTIONS Requests—The Mediation Server continuously communicates with the next-hop gateway through SIP OPTIONS requests. These exchanges are a method of validating a healthy connection between the two services. If these messages fail to be exchanged, Lync Server 2013 will alert administrators through the Lync Server Event Log.

Routing Timeouts—Lync Server 2013 identifies issues with a Mediation Server and next-hop gateway after a number of failed calls. If a Mediation Server is not able to route calls, it is marked as down. When this occurs, Lync Server routes calls through alternative routes if available; if not, users receive errors when making outbound calls and Event Logs are recorded identifying the error.

Whenever troubleshooting PSTN call issues, always ensure that a healthy connection between the Mediation Server and the Gateway is active. Look for the errors described previously, and also validate connectivity between the two servers utilizing tools such as Ping and Telnet.

2. Connectivity to Edge Servers

When Lync Edge Servers are deployed in the environment, the Mediation Server service requires constant communication with the Edge Server. The Mediation Server acts much like a Lync client in regard to Edge Server connectivity. When the Mediation Server is establishing any call, it must allocate Media Relay ports with the Edge Server in the event that a remote user might be involved. When the call is made from an internal user, this still happens, and although the actual call might not fail, a delay in call setup time can occur.

A common issue with call setup delays is connectivity between Mediation Servers and Edge Servers. Ensure that the Mediation Server can communicate with the Edge Server on port 3478 UDP and 443 TCP for port allocation. If that network connection is not available, a delay of several seconds might be incurred during call setup time. Additionally, if remote Lync users are not able to make calls to the PSTN, Edge Server connectivity is a key component to analyze.

3. DNS Records

Lync Server 2013 Mediation Server DNS requirements are fairly simple. However, because Mediation Server Pools rely on DNS load balancing, it is important to validate the DNS configuration. A Mediation Server Pool requires a DNS entry for each server in that pool. For every Mediation Server in the pool, ensure that there is an A record of the FQDN of the pool pointing to the IP of the server.


4. Logs

A good source of information in troubleshooting any server issue is the event logs. Lync Server 2013 creates a dedicated event log for informational activities, warnings, and errors within the standard Windows Server Event Viewer console. To view this event log, follow these steps:

1. Click Start.

2. Type eventvwr.msc and press Enter to open the Event Viewer Microsoft Management Console.

3. Expand the Applications and Services Logs folder.

4. Click the Lync Server log.

5. Examine the log for any warning or error events that might provide additional insight into any issues.

 
Others
 
- Microsoft Lync Server 2013 : Mediation Server Administration
- Microsoft Lync Server 2013 : Mediation Server Configuration
- Microsoft Lync Server 2010 : Installing Mediation Server (part 4) - Create Certificates
- Microsoft Lync Server 2010 : Installing Mediation Server (part 3) - Install Lync Mediation Server Components
- Microsoft Lync Server 2010 : Installing Mediation Server (part 2) - Create a Mediation Server Pool
- Microsoft Lync Server 2010 : Installing Mediation Server (part 1) - Hardware Recommendations
- Microsoft Lync Server 2010 : Mediation Server Overview
- Sharepoint 2013 : Creating and editing discussions (part 2) - Edit a discussion you have created
- Sharepoint 2013 : Creating and editing discussions (part 1) - Create a new discussion
- Sharepoint 2013 : Viewing badges and reputation scores for a member
 
Youtube channel
 
Top 10
 
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Finding containers and lists in Visio (part 2) - Wireframes,Legends
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Finding containers and lists in Visio (part 1) - Swimlanes
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Formatting and sizing lists
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Adding shapes to lists
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Sizing containers
- Microsoft Access 2010 : Control Properties and Why to Use Them (part 3) - The Other Properties of a Control
- Microsoft Access 2010 : Control Properties and Why to Use Them (part 2) - The Data Properties of a Control
- Microsoft Access 2010 : Control Properties and Why to Use Them (part 1) - The Format Properties of a Control
- Microsoft Access 2010 : Form Properties and Why Should You Use Them - Working with the Properties Window
- Microsoft Visio 2013 : Using the Organization Chart Wizard with new data
programming4us programming4us
 
Popular tags
 
Video Tutorail Microsoft Access Microsoft Excel Microsoft OneNote Microsoft PowerPoint Microsoft Project Microsoft Visio Microsoft Word Active Directory Biztalk Exchange Server Microsoft LynC Server Microsoft Dynamic Sharepoint Sql Server Windows Server 2008 Windows Server 2012 Windows 7 Windows 8 Adobe Indesign Adobe Flash Professional Dreamweaver Adobe Illustrator Adobe After Effects Adobe Photoshop Adobe Fireworks Adobe Flash Catalyst Corel Painter X CorelDRAW X5 CorelDraw 10 QuarkXPress 8 windows Phone 7 windows Phone 8 BlackBerry Android Ipad Iphone iOS