Welltech Dialogic SS7 Protocols ISUP - Manual (Page 127)

Dialogic ® SS7 Protocols ISUP Programmer's Manual Issue 15
127
offset 36, size 1: variant Specific variant of ISUP
selected for the group.
offset 37, size 1: ihop_count Initial hop count value
offset 38, size 2: base_cic_msb Most significant byte of the
base_cic, (BICC)
parameters
offset 40, size
24: Reserved for future use – set to zero.
ISUP Response
method By returning the message to the sender
type 0x3701
SUCCESS
ISP_BAD_ID
status
ISP_BAD_PARAM
Parameters
opc
The originating point code to be used in all ISUP messages issued for circuits
in the circuit group. The opc will usually be set to the same value for all
circuit groups at a signaling point.
dpc
The destination point code is the point code of the signaling point at the
remote end of the voice circuits in the circuit group.
base_cic
The Circuit Identification Code of the first circuit in the circuit group. This
value must be agreed between administrations before configuring the
module.
base_cid
The Circuit Identifier used for the circuit corresponding to the first cic in the
circuit group. The Circuit Identifier is of local significance only. The user
however must ensure that each cid is allocated to only one circuit group!
cic_mask
Each circuit group may contain up to 32 circuits. The circuits allocated to the
circuit group are identified by setting bits in the cic_mask. The least
significant bit (bit 0) corresponds to the first cic and must always be set. Bit
n in the cic_mask (if set) corresponds to circuit identification code =
(base_cic + n) and circuit identifier = (base_cid + n). If the bit is not set
then this cic and cid can instead be allocated to a different circuit group.
Note that a single circuit group may not span more than 32 cics (or 24 cics
for ANSI circuit groups).