8/12/2019 (Mobile Terminated Call) AXE DT_5
1/24
Objectives
MT call signaling sequences
DTs for MT call
8/12/2019 (Mobile Terminated Call) AXE DT_5
2/24
Signaling Sequences in GSM
Mobile Terminated Call
Normal Mobile Terminated Call
GMSC HLR VLR
Incoming Call
MSISDN Op. Send Routing Info Op. Provide Roaming Number
Roaming Number Provision Roaming Number Provision
ISUP call to the MSRN
8/12/2019 (Mobile Terminated Call) AXE DT_5
3/24
Signaling Sequences in GSM
Mobile Terminated Call
Mobile Terminated Call but MS detached or outof coverage
GMSC HLR VLR
Incoming Call
MSISDN Op. Send Routing Info Op. Provide Roaming Number
Return of the Forwarded Number CFNRC Subscriber is dettached or absent
ISUP call to the Forwarded number
8/12/2019 (Mobile Terminated Call) AXE DT_5
4/24
Signaling Sequences in GSM
Mobile Terminated Call
Terminated Call to MS but MS has CFU active
GMSC HLR VLR
Incoming Call
MSISDN Op. Send Routing Info
Return of the Forwarded Number CFU
ISUP call to the Forwarded number
8/12/2019 (Mobile Terminated Call) AXE DT_5
5/24
Signaling Sequences in GSM
Mobile Terminated Call
Terminated Call to MS but MS is busy or does not reply
and CFB or CFNRY is activatedGMSC HLR VLR
Incoming Call
MSISDN Op. Send Routing Info Op. Provide Roaming Number
Roaming Number Provision Roaming Number Provision
ISUP call to the MSRN
ISUP call to Forw. Number
8/12/2019 (Mobile Terminated Call) AXE DT_5
6/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
7/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
8/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
9/24
DTs for MT Call
8/12/2019 (Mobile Terminated Call) AXE DT_5
10/24
GMSC/VLR
Telecommunication
Service Analysis Pre-analysis B-number analysis
Routing Case analysisANRSI
RC CCH BR ROUTING SP DATA
23 NO P01=1 R=FIXGRI MM1 ..
65 YES P01=1 R=.. MM1
. . . .. .. ...
R= ISDNI
FNR, MNP
QUERY
4
HOME
SUBSCRIBER
MSRN
REQUEST
8/12/2019 (Mobile Terminated Call) AXE DT_5
11/24
DTs for MT Call
Incoming call to
694xxx
FLNAN
Subscriber is Home or
Imported?
HLR
Normal interrogation
Call is released with specific
Cause Code 14
TT=249,SSN=6
NOYES
TT=128,SSN=253, NS=30694
8/12/2019 (Mobile Terminated Call) AXE DT_5
12/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
13/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
14/24
DTs for MT Call
8/12/2019 (Mobile Terminated Call) AXE DT_5
15/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
16/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
17/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
18/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
19/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
20/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
21/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
22/24
8/12/2019 (Mobile Terminated Call) AXE DT_5
23/24
MT Call
8/12/2019 (Mobile Terminated Call) AXE DT_5
24/24
EXERCISES
Printout Commands
Define MSRNS
Define RC
Define B-number Analysis