ISUP Message
Service indicator octet(SIO)
10------ Network indicator:National network(NAT)
--00---- spare            :Spare(Spare)
----0101 Service indicator:ISUP
01010100 54 1C
--011100
Destination Point Code:1C 54
00------ EC 1C
00111011
----0111
Originating Point Code:1C EC
1001---- Signaling Link Selection:09
01111001 79 00
----0000
Circuit identification code:00 79
0000---- Spare:00
00000001 Message type:Initial Address (IAM)
***************Mandatory fixed part*****************
Nature of connection indicators
000----- spare:00
---0---- Echo control device indicator:outgoing half echo control device not included
----00-- Continuity check indicator   :continuity check not required
------00 Satellite indicator          :no satellite circuit in the connection
Forward call indicators
00------ ISDN user part preference indicator  :ISDN user part preferred all the way
--1----- ISDN user part indicator             :ISDN User Part used all the way
---0---- End-to-end information indicator @   :no end-to-end information available
----0--- Interworking indicator               :no interworking encountered (No. 7 signalling all the way)
-----00- End-to-end method indicator          :no end-to-end method available (only link-by-link method available)
-------0 National/international call indicator:call to be treated as a national call
0000---- Reserved for national use:00
----0--- spare                 :00
-----00- SCCP method indicator                :no indication
-------0 ISDN access indicator                :originating access non-ISDN
Calling party's category
11111111 Calling party's category:spare
Transmission medium requirement
00000000 Transmission medium requirement:speech
00000010 Pointer to mandatory variable part:02
00000111 Pointer to start of optional part:07
**************Mandatory Variable part***************
Called party number
00000101 Length indicator of Called party number:05
0------- Odd/even indicator                          :even number of address signals
-0000001 Nature of address indicator                 :subscriber number @
1------- Internal network number indicator (INN ind.):routing to internal network number not allowed
-001---- Numbering plan indicator                    :ISDN (Telephony) numbering plan (Recommendation E.164)
----0000 spare                                       :Spare(Spare)
address signal,F indicates ST,address complete
******** 34038F
*****************Optional part**********************
00001010 Calling party number
Calling party number
00000111 Length indicator of Calling party number:07
0------- Odd/even indicator                                        :even number of address signals
-0000011 Nature of address indicator                               :national (significant) number
0------- Calling party number incomplete indicator (NI) @          :complete
-001---- Numbering plan indicator                                  :ISDN (Telephony) numbering plan (Recommendation E.164)
----00-- Address presentation restricted (Pres. Restric.) indicator:presentation allowed
------11 Screening indicator                                       :network provided
address signal,F indicates ST,address complete
******** 7215670999
00111101 Hop counter
00000001 Length indicator of Hop counter:01
Hop counter
000----- Spare:00
---11101 Hop counter:1D
00000000 End of optional parameter