Signaling System No. 7 (SS7) is a set of telephony signaling protocols developed in 1975, which is used to set up and tear down most of the world's public switched telephone network (PSTN) telephone calls. We are going to introduce it very quickly. www.senatelecom.com

1. ‫ارتباط‬ ‫ساعیان‬
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Introduction to SS7
‫سیگنالینگ‬ ‫پروتکل‬SS7
‫دوم‬ ‫بخش‬

2. ‫ارتباط‬ ‫ساعیان‬
‫از‬‫سال‬1384
•‫ارائه‬‫کننده‬‫ی‬‫راهکارهای‬‫یکپارچه‬‫ارتباطی‬(UC)
•‫راهکارهای‬‫امنیتی‬‫ارتباطی‬
•‫راهکارهای‬‫مخابراتی‬Core
•‫سرویس‬‫های‬‫ابری‬
•‫راهکاری‬‫مدیریت‬‫تجربه‬‫مشتری‬(Contact Center, CRM)
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3. SS7 Addressing
• ITU
– 14 bits, 3-8-3 format or decimal
• ANSI
– 24 bits, 8-8-8 format
• SPC
– Self Point Code
– The address of the local system
• APC
– Adjacent Point Code
– Address of system on the other end of the signaling link
• DPC
– Destination Point Code
– Address of system that controls the voice CICs
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4. SS7 Addressing
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5. Point Code Formats
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• Decimal = 1234
• Hex = 0x4d2
• Binary = 0 - 10011010 - 010
• 3-8-3 = 0-154-2

6. ISUP
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• Call Signaling protocol of SS7
• Controls the status of CICs
– Resets, blocks, etc
• Controls the call setup
– Setup, acknowledge, hang-up, etc
• CICs
– Circuit Identification Code
– Integer number that uniquely identifies a time
slot on a span
– Used by all messages to id the specific channel
• ITU Q.762, Q.763. and Q.764
• ANSI (T1.113-YEAR)

7. Basic Call
Messages
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• IAM
– Initial Address Message
– Call request
• ACM
– Address Complete Message
– Acknowledges IAM
– Starts early media
• ANM
– Answer Message
– Answers the call

8. Basic Call
Messages
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• REL
– Release
– Request to hang-up a call
• RLC
– Release Complete
– Acknowledges a REL

9. Basic Call Flow
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10. Advanced Call
Messages
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• SAM
– Subsequent Address Message
– Sends additional call setup info (overlap)
• CPG
– Call Progress Message
– Used to signal additional info during call
setup
– Really only used for Supplementary Services
• CON
– Connect Message
– Can replace ACM+ANM

11. Advanced Call
Messages
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12. Circuit Control
Messages
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• RSC
- Reset Circuit Message
- Resets a single circuit to idle state
- Acknowledged with RLC
• BLO
- Circuit Blocking Message
- Single circuit is put into maintenance block
- Receiving side can not make calls on circuit
• BLA
- Blocking Acknowledge Message
- Acknowledges reception of BLO
• UBL
- Circuit Unblock Message
- Removes a previous maintenance block
• UBA
- Circuit Unblock Acknowledge Message
- Acknowledges reception of UBL

13. Circuit Group
Control
Messages
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• GRS
– Circuit Group Reset
– Resets a range of circuits
– Max range is 31
• GRA
– Circuit Group Reset Acknowledge
– Acks a GRS
• CGB
– Circuit Group Block
– Blocks a range of circuits
– Maintenance or Hardware block

14. Circuit Group
Control
Messages
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• CGBA
– Circuit Group Block Acknowledge
• CGU
– Circuit Group Unblock
• CGUA
• Circuit Group Unblock Ack

15. Circuit Group
Control
Messages
15
• CGBA
– Circuit Group Block Acknowledge
• CGU
– Circuit Group Unblock
• CGUA
• Circuit Group Unblock Ack

16. ‫ارتباط‬ ‫ساعیان‬
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