Lync LDM Info Test

The Lync Dialog Manager (LDM) service enables logging of Web Conferencing Server Connection Management which manages TLS/MTLS connections from clients and other servers such as the Web Conferencing Edge Server. The Lync Dialog Listener (LDL) module, when installed on every frontend server, tracks all INVITE/BYE-Commands and parses the SDP to find out the negotiated candidates. These commands/messages are sent to  the Lync Dialog Manager (LDM) using a HTTP-PORST. This is another service, which has to be installed somewhere within your network. The LDM will then talk to a network management backend to deliver the information. Whenever large number of messages are delivered, it becomes tedious for the administrators to keep track of the messages moving to and from the LDM. This is where the Lync LDM Info test helps! This test monitors the LDM server and reports the number of TCP connections that are active and the number of messages received by the server. Using this test administrators can easily figure out overload conditions of the server proactively before any serious performance issue is detected.

Target of the test : A Microsoft Skype for Business server

Agent deploying the test : An internal/remote agent

Outputs of the test : One set of results for the target Microsoft Skype for Business server that is to be monitored.

Configurable parameters for the test
Parameters Description

Test Period

How often should the test be executed.


The host for which the test is to be configured.


The port at which the specified host listens. The default port is 5060.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

Active TCP connections

Indicates the number of active TCP connections on the server.



Buffer allocation call rate

Indicates the number of buffer allocation calls per second.



Received messages

Indicates the number of messages that were received on the server during the last measurement period.


This measure is a good indicator on the load of the server.