Message Capture allows you to activate the capture of raw ISDN layer 3 messages between endpoints.
When activated, a small buffer is created in the /var/tmp directory, that stores each message being sent from or arriving on each channel. The buffer is circular, so it wraps around once it is full. When the buffer is full, it makes space by removing as many messages as required to store the next message. Therefore, once the buffer is full, the oldest call may still have some messages, but will probably not be the complete messaging for the call. Once the capture is activated, the user can select any channel to display. The messages are then formatted in a readable form from the stored ASN.1 format. The enable and buffer size settings are stored in the configuration. If the ISDN system restarts and the capture is enabled, the capture starts during ISDN system initialization. This allows capture of all D-channel messaging during layer 3 bring-up. The message capture works regardless of the ISDN settings being a network or client(user).
Enabling this does not cause any services to restart. If there are pending configuration changes, then a network restart will happen. When changing settings on this page, Ribbon recommends that all pending configuration changes be saved beforehand.
Configuring the Message Capture Settings
This section outlines how to configure the Message Capture settings.
This page is active only if T1 is configured for PRI service.
To Configure the Message Capture Settings:
Choose Network > ISDN > Message Capture.
Configure settings using the information in the following table as a guide. When you have finished configuring settings, click Submit.