SMSProxy Technial Implementation

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SMSProxyTechnial Implementation

• SMS Accounting
• SMS Filtering
• SMS Interworking
• SMS Hubbing

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Point of Interception

• Two solutions
• on the international links
• on the internal links

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SMS Filtering (Spamming)

• Content based spam filter
• Detection of repetitive patterns
• Automated reporting
• Manual filtering rules

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SMS Filtering (Flooding)

• Volume Threshold by source
• Alerting of excessive use
• Automatic or manual blocking

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SMS Filtering (Faking)

• Faked SMSC sends Send Routing Info for SM

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SMS Filtering (Faking)

• HLR responds
• SMS Proxy alters information on the fly with
  unique IMSI and VLR/MSC Location
• Memorizes Transaction

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SMS Filtering (Faking)

• Fake SMSC tries to forward SM with fake SMSC
  number
• SMS Proxy validates against previous SRI
  Request/Response

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SMS Filtering (Faking)

• If originating SCCP Address matches the one from
  SRI_SM pass
• Replace pseudo MSC/IMSI with real one and forward

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SMS Filtering (Faking)

• If originating SCCP Address does not match
  original SRI_SM request its faked!
• Drop message and report.

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SMS Filtering (Spoofing)

• SMS MO from faked MSC makes operator believe
  subscriber has sent SMS.

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SMS Filtering (Spoofing)

• SMS Proxy verifies location on HLR

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SMS Filtering (Spoofing)

• If location matches pass

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SMS Filtering (Spoofing)

• If location doesnt match dump and report

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SMS Filtering(Smart Spoofing)

• Spoofing MSC sends Send Routing Info for SM first
  to get location of Subscriber

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SMS Filtering(Smart Spoofing)

• Spoofing MSC receives altered SRI with virtual
  MSC location and IMSI

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SMS Filtering(Smart Spoofing)

• SMS Proxy receives SMS-MO from virtual MSC number
  which never can be the source of SMS-MO
• Dump and report

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SMS Filtering(Known MSC Spoofing)

• SMS Proxy receives SMS-MO from guessed/well known
  home network MSC number which could be real
  location of subscriber
• Not supposed to arrive from outside
• Dump and report

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SMS Filtering(GT Scanning)

• Spoofing Filter makes all GT scan unsuccessful.
• Flooding Filter detects and reports.

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SMS Filtering Summary

• Deals with all IR.70 cases
• Spamming
• Flooding
• Faking
• Spoofing
• GT Scanning

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SMS Interworking

• Allows non GSM networks to look like GSM for SMS
• Emulates HLR and MSC for incoming SMS.
• Is an SMSC for outgoing SMS.
• Translates from SS7 to SMPP and vice versa.

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SMS Hubbing

• Breaks out SMS from existing Signalling path
• Reroutes SMS according to rulesets
• GSMA SMS Hubbing Group based technical solution

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SMS Hubbing
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SMS Proxy

• A solution for all your messaging needs.

Pat. pending
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Global Networks Schweiz AG

• Clarastrasse 3
• 4058 Basel
• Switzerland
• info_at_global-networks.ch