GSM / UMTS MAP Protocol Analysis
SS7 (Signaling System 7) separates the information required to set up and manage telephone calls in the Public Switched Telephone Network (PSTN) onto
a separate packet switched network (Signaling Network). It uses Message Signal Units (MSUs), Link Status Signal Units (LSSUs), and Fill-In Signal Units (FISUs)
as signal units. The main protocols include MTP (Message Transfer Part - Level 1 to 3), SCCP (Signaling Connection Control Part), and ISUP (ISDN User
As a result of introducing new IN services there is a demand for increase in SS7 network capacity. SS7 High Speed Link (HSL) is defined to meet this requirement which uses entire T1 (or E1) bandwidth instead of just 56 kbit/s or 64kbit/s to carry SS7 signaling. The HSL technology can be implemented either using unchannelized HDLC (over MTP2), ATM (ATM layers replace MTP1 and 2), or SIGTRAN. Traditional LSL links will have up to 24 or 31 links per T1or E1, respectively, while HSL and ATM both have only one link per T1 or E1.
GL's SS7 Analyzer supports decoding different SS7 layers like MTP2, MTP3, ISUP, TUP, SCCP, INAP (CS1, CS2), IUP, BICC, BISUP, BTUP and many application layer protocols from GSM/GPRS/UMTS network like MAP, CAMEL(CAP), and so on. The SS7 Analyzer supports decoding of both Low Speed Links (LSL) of 56 kbps or 64 kbps DS0 links or high-speed 1.544 Mbps or 2 Mbps unchannelized T1/E1 High Speed Signaling Links (HSL).
Both real-time and off-line analysis present information in four layers:
- Raw HDLC Frame data as a hexadecimal and ASCII octet dump
- MTP2 and MTP3 information
- ISUP, TUP, SCCP, BICC, INAP, MAP, BTUP etc. information
Different SS7 layers like MTP2, MTP3, ISUP, TUP, SCCP, INAP (CS1, CS2), IUP, BICC, BISUP, BTUP and many application layer protocols from GSM/GPRS
network like MAP, CAMEL(CAP), IS 41 etc are decoded according to ANSI/ITU/ETSI/CHINA/UK standards and displayed in an organized fashion.
GL Communications supports the following types of SS7 analyzers:
- Real-time SS7 Analyzer (Pre-requisites: GL's field proven E1 or T1 internal cards or USB Laptop E1 or T1 external units, required licenses and Windows
XP (or higher) Operating System)
- Remote/Offline SS7 Analyzers (Pre-requisites: Hardware Dongles and Windows XP (or higher) Operating System)
Also, visit GL's SIGTRAN protocol decode web page for a description of SIGTRAN - used to carry Q.931 or SS7 ISUP messages
between IP nodes such as a Signaling Gateway and Media Gateway Controller or Media Gateway.
In addition the following SS7 application is supported that further help in emulating SS7 protocol
SS7 Analyzer Main Features:
- Supports analysis of SSP-STP (A link, E link), STP-STP (B link, C link), & SSP-SSP (F link) interfaces
- Supports analysis of GSM/UMTS MAP interfaces
- B (Interface b/w the MSC and its associated VLR)
- C (Interface b/w the HLR and the MSC)
- D (Interface b/w the HLR and the VLR)
- E (Interface b/w MSCs)
- F (Interface b/w MSC and EIR)
- H (Interface between HLR and AuC)
- J (Interface b/w the HLR and the gsmSCF)
- Displays Summary, Detail, Hex-dump, Statistics, and Call Detail Views.
- Summary View displays MTP2, MTP3 information and SS7 Message types, Called and Calling number, SCCP message type, SSN, INAP information, IUP
information, BICC message type, and more in a tabular format.
- Detail View displays decodes of a user-selected frame from the Summary View, the contents of this view can also be copied to clipboard.
- Capable of decoding many important protocols from GSM/GPRS network i.e. MAP, CAP.
- Hex Dump View displays the frame information in HEX and ASCII format, the contents of this view can also be copied to clipboard.
- Streams can be captured on the selected time slots (contiguous or non-contiguous), sub-channels, or full bandwidth. Frames can be transmitted/captured in either, n x 64 kbps, or n x 56 kbps data channels.
- Statistics View displays call and MSU statistics at any link or entire link set.
- Call trace isolates call specific information i.e. status of each call (i.e. active/completed), duration of completed call, OPC, DPC, CIC, Called and Calling Party
Numbers, and more.
- Exports Summary View information to a comma delimited file for subsequent import into a database or spreadsheet.
- Capability to export detail decodes information to an ASCII file.
- Recorded trace files can be played back using HDLC Playback application.
- Flexibility to select/hide the call trace columns as required by the user.
- Call Detail Recording feature includes data link groups that help in defining the direction of the calls in a given network and form logical groups comprised
of unidirectional (either 'Forward' or 'Backward') data links.
- Supports filtering and search based on Frame length, FSN, BSN, SSN, and so on.
- Any protocol field can be added to the summary view, filtering, and search features providing users more flexibility to monitor required protocol fields.
- HDLC (according to Q.921) based SS7 frames are parsed based on ANSI and ITU standards.
- Ability to configure the .ini file for custom decoding options such as SSN value of INAP, MAP, CAP, CNAM, TCAP and IS41, and more.
- Remote monitoring capability using GL's Network Surveillance System.
Additional features supported by real-time/ remote SS7 analyzer are:
- Real-time filter and search features on various SS7 message types.
- Streams can be captured on the selected time slots (contiguous or non-contiguous), sub-channels or full bandwidth. Frames may also be contained in
either one, n x 64 kbps, or n x 56 kbps data channels.
- The following variations are accommodated in the software: inverted or non-inverted data, byte reversal or non-reversal.
- Supports decoding of frames with FCS of 16 bits and 32 bits, or none
- Recorded trace files can be played back using HDLC Playback application.
- Multiple remote clients may access a single T1/E1 server. Also, the T1/E1 server is fully functional while being accessed as a server. Thus, a user may
perform T1/E1 operations locally on the server while a client is accessing the same server, in real time.(For Remote Analyzers only).
- Multiple streams of SS7 traffic on various T1/E1 channels can be simultaneously decoded with different GUI instances.
Additional features supported by Offline SS7 Analyzer:
- Trace files for analysis can be loaded through simple command-line arguments.
- Multiple trace files can be loaded simultaneously with different GUI instances for offline analysis.
GL's SS7 Analyzer supports the following ANSI/ITU/ETSI/CHINA/UK protocol standards:
|MTP2, MTP3 ANSI
||ITU - Q.761, Q.762, Q.763 and Q.764
||EN 300 356 -1 V3.2.2(1998-08)Part 1
||ANSI - T1.113.1 to T1.113.4
||Ministry of Posts and Telecommunications of the People's Republic of China, Technical Specification of ISUP, 1996
|Test & Network Management Messages (ANSI)
||ANSI T1.111.4, ANSI T1.111.7
||ANSI rec. T.112 (1996), T1.116.2 (1996)
||EN 300 009 -1 ,sept 1996, 3rd edition
||GR-1188-CORE Issue 3, April 2009
|TCAP ANSI IS-41
||TIA/EIA/ IS41.1-C /IS-41.5-C
||ITU-T Q.771 to Q.775
||ETSI ETS 300 134
|INAP CS1 ITU / ETSI
||Q1218(10 / 95)and ETSI 300 374 1, Sept, 1994
|INAP CS2 ITU
||INAP - Capability Set 2. (Q.1228)
|INAP CS2 ETSI
||INAP - Capability Set 2. (EN 301 140-1-v1.3.4-1999-06)
||3GPP TS 29.078 V3.15.0 (2003-03)
||3GPP TS 29.078 6.3.0(2004-09)
||3GPP TS 09.02 V7.14.0 (2003-09)
||3GPP TS 29.002 V4.18.0 (2007-09)
||Q.2763, Q.2931, Q.2933, Amendment 2 of Q.2931, Q.2941.1 etc
||T-REC-Q.1902.1-200107, T-REC-Q.1902.2-07/2001, T-REC-Q.1902.3-07/2001, T-REC-Q.1902.4-200107 (pl-080r1)
|IUP ITU (BTUP) Proprietary Extensions To C7 Interconnect User Part (IUP).
||ND1006:2005/02 PNO-ISC/SPEC/006 / ND1104:2004/11 PNO-ISC/INFO/004 ND1104:2004/11 PNO-ISC/INFO/004
|Network Management Messages (CHINA)
Click here to view the protocol glossary page for more information
Summary, Detail and Hex dump Views
The SS7 analyzer application is invoked from the main menu of GL's T1/E1 Analyzer for real-time analysis. The Remote/offline analyzer is invoked from the
installation directory of the remote/offline SS7 analysis. The analyzer displays Summary, Detail and Hex dump Views in different panes. The Summary View
displays Direction, Frame Number, Time, Length, BSN, BIB, FSN, DPC, OPC, CIC, SSN, Called and Calling number and various types of SS7 messages for all the
frames. User can select a frame in Summary View to analyze and decode each frame in the Detail View. The Hex dump View displays the frame information in
HEX and ASCII format.
Screen Shot of Summary, Detail and Hex dump View
Real-time/Remote and Off-Line Analysis
Users can capture and analyze SS7 frames in real-time and can record entire traffic or filtered traffic into trace file. The recorded trace file can be used for
offline analysis or exported to a comma-delimited file, ort ASCII file. The raw data capturing requires user to specify timeslots, bit inversion, octet bit reversion,
user/network side, and hyper channel selection options. The captured raw data can then be transmitted using HDLC playback file application.
Screen Shot of Real-time and Off-line Analysis
Filtering and Search
Users can record all or filtered traffic into a trace file. Filter and search capabilities adds another powerful feature to the SS7 Analyzer. These features isolate
required frames from the captured frames in real-time/remote/offline analysis. In real-time capturing, filter based on length of frames can be set. The frames can
be filtered after completion of capture based on BSN, BIB, FSN, FIB, Status Field, OPC, DPC, SSN, CIC, Called and Calling party number and types of different SS7
message. Similarly, search capability helps user to search for a particular frame based on specific search criteria
Screen Shot of Filtering and Search
Screen Shot of Real-time Capture Filter
Call Detail Records and Statistics View
Important call specific parameters like Call ID, Call disposition, Call duration, Mobile ID, Called/Calling Number, Status of each call (i.e. active/completed along with the messages), Call type (SMS/PDP/Setup/Location update etc) are displayed for SS7 (ITU/ANSI/ETSI/China) standards in the Call Detail Records View. Call Detail Recording feature includes data link groups that help in defining the direction of the calls in a given network and form logical groups comprised of unidirectional (either 'Forward' or 'Backward') data links. Additionally, users are provided with the option to search for a particular call detail record from the captured traces.
We can reliably handle SS7 capturing + CDR building on
- 2 bi-directional ports x 31 links = 62 uni-directional links
- 3 bi-directional ports x 20 links = 60 uni-directional links
Statistics is an important feature available in SS7 analyzer and can be obtained for all frames both in real-time as well as offline mode. Numerous statistics
can be obtained to study the performance and trend in the SS7 network is based on protocol fields and different parameters.
Screen Shot of Statistics and Call Detail Records View
Enhanced Trace Saving Options
Users can control the captured trace files by saving the trace using different conventions such as trace files with user-defined prefixes, trace file with
date-time prefixes, and slider control to indicate the total number of files, file size, frame count, or time limit. This feature also allows the captured frames to be
saved into a trace file based on the filtering criteria set using display filter feature.
Screen Shot of Enhanced Trace Saving Options
Save/Load All Configuration Settings
Protocol Configuration window provides a consolidated interface for all the important settings required in the analyzer. This includes various options such
as protocol selection, startup options, stream/interface selection, filter/search criteria and so on. All the configuration settings done in any of these options can
be saved to a file, loaded from a configuration file, or user may just revert to the default values using the default option.
Screen Shot of Save/Load All Configuration Settings
Typical CPU usage
The below table depicts the performance monitoring of SS7 in different scenarios for a PC configuration with Pentium 4 processor, 2 GHz clock speed and
256 Mb RAM.
||No of cards
||No of SS7 links
|One Bidirectional T1
||One Dual PCI T1 card
||21 SS7 links
|Two Bi-directional T1s
||Two Dual PCI T1 cards
||10 SS7 links
- Call rate is not an effecting factor as the SS7 links carry FISUs and LISUs.
- When the Analyzer is connected to Database via Sockets, additional 2-3% CPU usage is expected.
Scripted ISUP Emulation using MAPS™
GL's MAPS™ SS7 is an advanced protocol simulator/tester for ISUP simulation over TDM (E1/T1). MAPS™ SS7 can simulate Service Switching Point
(SSP). The ISUP Signaling specification conforms to ITU-T and ANSI standards. MAPS™ SS7 functionality covers the ITU and ANSI variant of SS7 implementing
MTP2, MTP3, and ISUP protocols. For more details, click here.
Scripted MAP Emulation using MAPS™
GL’s MAPS™ MAP (Mobile Application Part) Emulator is an advanced protocol simulator to simulate MAP messages and Signaling over D & H interface in
GSM/UMTS networks as defined by 3GPP standards. For more details, click here
DCOSS (Digital Central Office Switch Simulator) SS7 Emulation
DCOSS SS7 utilizes a user-friendly GUI in which the complex SS7 configuration can easily be created, thus allowing DCOSS SS7 to be fully functional within a
few minutes. DCOSS SS7 also incorporates the flexibility to modify SS7 parameters, both at the MTP and ISUP/TUP layers as well as the ISUP/TUP message
content. For more details, click here.
Bridge and Monitor Connections
Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which
the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units),
UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.
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