Call Setup

To make a call, send a SETUP message down to Q.93B and wait for a SETUP_ACK from Q.93B. The SETUP message should include a Broadband Higher Layer Information (BHLI) information element that contains a four-octet SAP identified as User Specific Information. The SAP is used to identify the application on the receiving host to which the Q.93B should direct the message. After receiving a SETUP_ACK with a 0 error field, wait for either a CALL_PROCEEDING, ALERTING, CONNECT, or RELEASE_COMPLETE message from Q.93B (all other messages are ignored by Q.93B). After you receive the CONNECT message, you can use the virtual channel.

Respond to a SETUP message from Q.93B with either a CALL_PROCEEDING, ALERTING, CONNECT, or RELEASE_COMPLETE message to Q.93B. After yu receive the CONNECT_ACK message, you can use the virtual channel.