Sending Messages

When an application sends a message by using the sip_sendmsg() function, the stack calls the sip_conn_send() function. The connection manager registers the sip_conn_send() function with the stack. The stack calls the sip_conn_send() function after the stack processes the outbound message. In case of a network error, the application can define the response of the connection manager, including returning an error. The connection manager's behavior must be consistent for all subsequent calls that use the same connection object. The connection manager can create a new connection to update an existing connection. The connection manager must flush any stale TCP data that is left in the connection object as a result of breaking the TCP stream at message boundaries. The connection manager uses the library function sip_clear_stale_data() to flush any stale TCP data. The Connection Manager must not change the transport type of a connection object.