This section describes the sequence of events involved when there is an
unrecoverable error on a CCS trunk when only a single channel is affected.
Figure 1. Unrecoverable 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.](./ueccsone.gif)
- A channel is enabled, and there is an active call on the channel.
- The signaling process detects any internal error that affects a single
channel. (For example, corruption of an internal data structure.)
- The signaling process clears the call to the network if possible.
- The signaling process clears the call to Blueworx Voice Response by sending the SL_CALL_TERMINATE_IND primitive.
- The signaling process logs an error using CA_LOG_ERROR().
- The signaling process disables the channel by sending the SL_CHANNEL_DISABLE_IND primitive.
- The channel is now disabled.
- If the system manager re-enables the channel using SL_CHANNEL_ENABLE_REQ the signaling process should re-initialize its internal data structures.