This section describes the sequence of events involved when there is a
transient error on a CCS trunk affecting a single channel.
Figure 1. Transient error on a CCS trunk affecting a single
channel
![The graphic is a very simplified representation of the process described in detail in the next section.](./trnasone.gif)
- A trunk is enabled, and there are active calls on the trunk.
- The signaling process detects a network condition that means that a single
channel on the trunk is temporarily unavailable for use. Or, the signaling
process detects a transient internal error that affects a single channel.
- The signaling process logs an error using CA_LOG_ERROR().
- The signaling process places the channel in the alarm state by sending
the SL_CHANNEL_ALARM_IND primitive with fAlarm set
to TRUE.
- The channel is now alarmed.
- When the signaling process detects that the alarm condition has passed,
it removes the channel from the alarm state by sending SL_CHANNEL_ALARM_IND with fAlarm set to FALSE.