Welltech Dialogic SS7 Protocols ISUP - Manual (Page 170)

Section 8 Non-Primitive Interface
170
flags
Sets by the ISUP module, or by the user application to indicate or request
information respectively.
Bit Mnemonic Description
0 UIHB_FLAGS_CGRPS
_BLOCKED
The UIHB_FLAGS_CGRPS_BLOCKED flag
can be set in heartbeat messages from the
ISUP module and from the user application.
If set in heartbeat messages from the ISUP
module, this indicates to the user, that the
ISUP circuit group(s) have been blocked.
If set in heartbeat messages from the user
application, this indicates to the ISUP
module, that the user application is once
again available and in service.
1 UIHB_FLAGS_HB_RQ
ST
The UIHB_FLAGS_HB_RQST flag can only
be set in Heartbeat messages from the user
application to the ISUP module.
If set, this is used by the user application to
request a new heartbeat message
immediately from the ISUP module. The
user application should send this to
determine whether the ISUP circuit groups
have been blocked.