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# Mobile Application Part (MAP) (GSM MAP)
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Transfers between entities of a Public Land Mobile Network (PLMN) information specific to the PLMN in order to deal with the specific behaviour of roaming Mobile Stations (MS)s.
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## History
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XXX - add a brief description of PROTO history
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## Protocol dependencies
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- [TCAP](/TCAP): Typically, GSM MAP uses [TCAP](/TCAP) as its transport protocol. The Subsystem number (ssn) is used to identify GSM MAP
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## Example traffic
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No. Time Source Destination Protocol Info
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1 0.000000 1041 8744 GSM MAP invoke processUnstructuredSS-Request
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map-open
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destinationReference: 9656051124006913F6
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1... .... = Extension: No Extension
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.001 .... = Nature of number: International Number (0x01)
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.... 0110 = Number plan: Land Mobile Numbering (ITU-T Rec. E.212) (0x06)
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Address digits: 655011420096316
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GSM Mobile Application
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Component: invoke (1)
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invoke
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invokeID: 1
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opCode: localValue (0)
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localValue: processUnstructuredSS-Request (59)
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Data coding: 0x0f
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SMPP Data Coding Scheme: Unknown (0x0f)
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GSM SMS Data Coding
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0000 .... = DCS Coding Group for SMS: SMS DCS: General Data Coding indication - Uncompressed text, no message class (0x00)
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..0. .... = DCS Text compression: Uncompressed text
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...0 .... = DCS Class present: No message class
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.... 11.. = DCS Character set: Reserved (0x03)
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GSM CBS Data Coding
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0000 .... = DCS Coding Group for CBS: CBS DCS: Language using the GSM 7-bit default alphabet (0x00)
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..00 1111 = DCS CBS Message language: Language not specified (0x0f)
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USSD String: *140*0761241377#
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msisdn: 917267415827F2
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1... .... = Extension: No Extension
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.001 .... = Nature of number: International Number (0x01)
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.... 0001 = Number plan: ISDN/Telephony Numbering (Rec ITU-T E.164) (0x01)
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ISDN Address digits: 27761485722
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## Wireshark
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The GSM MAP dissector is fully functional.
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## Preference Settings
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The only preference is "TCAP SSNs" which is a range of SSNs on which gsm\_map dissector is triggered.
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## Example capture file
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- [SampleCaptures/gsm\_map\_with\_ussd\_string.pcap](uploads/__moin_import__/attachments/SampleCaptures/gsm_map_with_ussd_string.pcap)
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## Display Filter
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A complete list of GSM MAP display filter fields can be found in the [display filter reference](http://www.wireshark.org/docs/dfref/g/gsm_map.html)
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Show only the GSM MAP based traffic:
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```
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gsm_map
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```
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## Capture Filter
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## External links
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- [3GPP TS 29.002](http://www.3gpp.org/ftp/Specs/html-info/29002.htm) Mobile Application Part (MAP) specification **
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## Discussion
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---
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Imported from https://wiki.wireshark.org/GSMMAP on 2020-08-11 23:14:24 UTC |
