This section describes the sequence of events during setup of an incoming
call.
Figure 1. Exchange data link: successful incoming call
![The graphic is a very simplified representation of the process described in detail in the next section.](./edlgoodin.gif)
Description of flows
The flows shown in Figure 1 are as follows:
- An incoming call is indicated by the network using channel associated
signaling.
- The network sends the call information over the exchange data link.
- The signaling process notifies Blueworx Voice Response of the call information. The signaling
process creates an SL_CALL_SETUP_IND primitive, and sends
it to Blueworx Voice Response using the sl_send_indication() subroutine call.
- The call is answered using channel associated signaling.
- Blueworx Voice Response uses the call information contained in the SL_CALL_SETUP_IND primitive to set the system variables that contain the called number
and the calling number. These are System : Call info : Called Number (SV185) and System : Call Info Calling Number (SV186).
- The system variables are used to select which state table is used to answer
the call. The values of the system variables are also available to the state
table for its own use.