Dialogic 6.2 - Manual (Page 320)

ISDN Call Processing Overview
November 2009 320
It is also possible to configure BSMI to generate a SETUP_ACK
rather than a CALL_PROCEEDING message upon arrival of a setup
message.
Figure 48. ISDN Incoming Call
As in the case of a call, BSMI also handles the call model where a
SETUP_ACK generated instead of a call proceeding.
Network Module Host
CALL PROCEEDING
ALERTING
CONNECT
L3L4mSETUP_IND
SETUP
L4L3mALERTING_REQUEST
L4L3mCONNECT_REQUEST
CONNECT ACKNOWLEDGE