Hey Friends....
Here m going to discuss about Voip Security
SMS & SMSC Overview :
• SMS is a globally accepted wireless service that enables the
Transmission of alphanumeric messages between mobile subscribers
And external systems such as e-mail, paging and voice mail systems.
• SMSC is a server which serves as a main controller for routing of
Short messages and for storing and forwarding of SMS.
•Reasons why SMSC is required?
• Routing of SMS
• Temporary storage
• Retries
• Value added service on SMS
• Interconnect mechanisms for various services like Paging, VMS,
E-mail, etc.
SMS routing in GSM:
1. SMSC server itself having Gateway functionality.
2. SMSC server only for storing and forwarding and MSC is having
Gateway functionality.SMSC - 1
• In this set up the SMSC server is connected to MSC via ss7 signaling
Links and talks on MAP layer.
• The SMSC server itself performs the SMS routing functionality and
Sends and receives MAP layer messages.
Advantage
• Since the SMSC itself is doing the routing, it becomes very easy to
Troubleshoot various SMS routing related problems.
Disadvantage
• High number of signaling links required to handle high SMS traffic.
Hence it requires costly SS7 cards and stacks in the SMSC server itself.
SMSC - 2
• In this set up the SMSC is connected with MSC on TCP/IP links.
• This set up with SMSC is only possible with Nokia MSC. It is not
Supported with other vendor’s MSC.
Advantage :
• Very less number of TCP/IP links can cater to very high SMS traffic.
• Disadvantage:
• The functionality of SMSC server is restricted to only store and
Forward. It is also very difficult to resolve routing related
Functionalities as MSC are doing the same.
SMSC External Interfaces :
SMS Types :
• MO-MT (Mobile Originated- Mobile Terminated)(Like simple Messaging)
• AO-MT (Application Originated - Mobile terminated)(Like way2sms, smsgupshup, and 160by2)
• MO-AT (Mobile Originated- Application terminated)(Like Facebook Messaging, Voting Apps, and KBC registration)
• AO-AT (Application Originated -Application terminated)(Like Nimbuzz)
SCCP/SDCCH Address info
07917283010010F5040BC87238880900F1
0000993092516195800AE8329BFD4697D9.
07- Length of the SMSC information (in these case 7 octets)
91 - Type-of-address of the SMSC. (91 means international format of the phone number)
72 83 01 00 10 F5- Service center number (in decimal semi-octets).
Added to form proper octets. The phone number of this service center is "+27381000015".
04- First octet of this SMS-DELIVER message
0B-Address-Length. Length of the sender number (0B hex = 11 dec)
C8-Type-of-address of the sender number
72 38 88 09 00 F1- Sender number (decimal semi-octets), with a Trailing F.
SMS Forging :
• SMS Forging is the Technology which anyone can send SMS from
Any number of their choice.
• This is made possible due to AO-MT feature of SMSC.
• When SMS is sent using application, it is routed through
international gateways.
• Message id of SMS is spoofed at International gateway.
• Finally SMS is routed to destination SMS Center number.
• As there is no authentication system, it is sent to destination
number with spoof ID.
Here m going to discuss about Voip Security
SMS & SMSC Overview :
• SMS is a globally accepted wireless service that enables the
Transmission of alphanumeric messages between mobile subscribers
And external systems such as e-mail, paging and voice mail systems.
• SMSC is a server which serves as a main controller for routing of
Short messages and for storing and forwarding of SMS.
•Reasons why SMSC is required?
• Routing of SMS
• Temporary storage
• Retries
• Value added service on SMS
• Interconnect mechanisms for various services like Paging, VMS,
E-mail, etc.
SMS routing in GSM:
SMSC Implementation
There are two ways to implement the SMSC server in GSM network.
1. SMSC server itself having Gateway functionality.
2. SMSC server only for storing and forwarding and MSC is having
Gateway functionality.
• In this set up the SMSC server is connected to MSC via ss7 signaling
Links and talks on MAP layer.
• The SMSC server itself performs the SMS routing functionality and
Sends and receives MAP layer messages.
Advantage
• Since the SMSC itself is doing the routing, it becomes very easy to
Troubleshoot various SMS routing related problems.
Disadvantage
• High number of signaling links required to handle high SMS traffic.
Hence it requires costly SS7 cards and stacks in the SMSC server itself.
SMSC - 2
• In this set up the SMSC is connected with MSC on TCP/IP links.
• This set up with SMSC is only possible with Nokia MSC. It is not
Supported with other vendor’s MSC.
Advantage :
• Very less number of TCP/IP links can cater to very high SMS traffic.
• Disadvantage:
• The functionality of SMSC server is restricted to only store and
Forward. It is also very difficult to resolve routing related
Functionalities as MSC are doing the same.
SMSC External Interfaces :
SMS Types :
• MO-MT (Mobile Originated- Mobile Terminated)(Like simple Messaging)
• AO-MT (Application Originated - Mobile terminated)(Like way2sms, smsgupshup, and 160by2)
• MO-AT (Mobile Originated- Application terminated)(Like Facebook Messaging, Voting Apps, and KBC registration)
• AO-AT (Application Originated -Application terminated)(Like Nimbuzz)
SCCP/SDCCH Address info
07917283010010F5040BC87238880900F1
0000993092516195800AE8329BFD4697D9.
07- Length of the SMSC information (in these case 7 octets)
91 - Type-of-address of the SMSC. (91 means international format of the phone number)
72 83 01 00 10 F5- Service center number (in decimal semi-octets).
Added to form proper octets. The phone number of this service center is "+27381000015".
04- First octet of this SMS-DELIVER message
0B-Address-Length. Length of the sender number (0B hex = 11 dec)
C8-Type-of-address of the sender number
72 38 88 09 00 F1- Sender number (decimal semi-octets), with a Trailing F.
SMS Forging :
• SMS Forging is the Technology which anyone can send SMS from
Any number of their choice.
• This is made possible due to AO-MT feature of SMSC.
• When SMS is sent using application, it is routed through
international gateways.
• Message id of SMS is spoofed at International gateway.
• Finally SMS is routed to destination SMS Center number.
• As there is no authentication system, it is sent to destination
number with spoof ID.
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