Description: The maximum waiting delay (Tdmax) timeout value used by the media gateway to send the Restart In Progress with the restart method as RM:disconnected to the call agent when the voice interface associated ds0-group disconnection condition occurs.

The DS0 group (voice interface) becomes disconnected when it tries to communicate with the call agent and the retransmission procedure times out after retrying.

The DS0 group (voice interface) in disconnected state starts the disconnected timer initialised to the random value and uniformly distributed between 1 and initial waiting delay (Tdinit) in seconds.

The gateway waits for either the expiration of the timer, or the reception of call agent command or the detection of local user activity for the DS0 group (voice interface).

When the disconnected timer elapses, or when a command is received from the call agent or when there is a local user activity, the media gateway sends the Restart In Progress command with the restart method as RM:disconnected to the call agent.

If the disconnected procedure still left the DS0 group (voice interface) disconnected, the disconnected timer is doubled subject to a provisionable disconnected maximum waiting delay (Tdmax) in seconds and the gateway starts the new disconnected procedure again.

Once the maximum value is reached, the subsequent disconnected Restart In Progress commands use the maximum waiting delay (Tdmax).