Dialogic 6.2 - Manual (Page 360)

Enabling the R2 Protocol
November 2009 360
In the event that a failure occurs after the optional L3L4mPRE_
SEIZE message, but before the L3L4mSETUP_IND message, BSMI
will issue an L3L4mSTATUS_IND message containing the IISDN_
R2_CALL_STATUS structure that identifies the reason for the call
failure. No host action is required in this case, but the status
indication is logged for informational purposes.
Figure 55. Inbound Call Setup
(1) L3L4mPRE_SEIZE
Host
(2) L3L4mSETUP_IND
If call is accepted ...
(3) L4L3mCONNECT_REQUEST
(4) L3L4mCONN_ACK_IND
Else, if call is rejected ...
(3) L4L3mCLEAR_REQUEST
(4) L3L4mCLEAR_REQUEST