Konrad Hammel Sangoma Technologies

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Presentation transcript:

Konrad Hammel Sangoma Technologies 4/14/2017 Introduction to SS7 Konrad Hammel Sangoma Technologies

Outline What is SS7? SS7 Network Elements SCP, STP, and SSP 4/14/2017 Outline What is SS7? SS7 Network Elements SCP, STP, and SSP SS7 Link Types A,B,C,D,E, and F links Basic Call Messages IAM, ACM, ANM, REL, and RLC SS7 Signaling Stack MTP1, MTP2, MTP3, ISUP, and others SS7 Signaling Messages FISU, LSSU, and MSUs SS7 Addressing SPC, DPC, and APC

What is SS7? Signaling System 7 CCSS7, C7, number 7, CCIS7 4/14/2017 What is SS7? Signaling System 7 CCSS7, C7, number 7, CCIS7 Official Standard by ITU in 1980 Common Channel Signaling (CCS) Signaling channel, CICs 2 versions…ITU and ANSI Universal signaling via a suite of sub-protocols ISUP, TUP, DUP, etc

SS7 Network Elements 3 types of Switches Signal Switching Points (SSP) 4/14/2017 SS7 Network Elements 3 types of Switches Signal Switching Points (SSP) Terminate signaling links Start, end, and switch calls Signal Transfer Points (STP) Main routing switches Signal Control Points (SCP) Switches attached to Databases

4/14/2017 SS7 Network Elements

SS7 Link Types A Links Link between to end-points 4/14/2017 SS7 Link Types A Links Link between to end-points “A” stands for Access Purpose is to deliver signaling messages Connects an SSP to an STP Connects an SCP to an STP C Link Link between 2 STPs (making them a “mated” pair) “C” stands for Cross Link

4/14/2017 SS7 Link Types

SS7 Link Types B Links Link between 2 mated STP pairs 4/14/2017 SS7 Link Types B Links Link between 2 mated STP pairs “B” stands for Bridge Link D Links Link between 2 mated STP pairs (different hierarchical levels) “D” stands for Diagonal Link

4/14/2017 SS7 Link Types

SS7 Link Types E Links Link between an SSP and a secondary mated STP 4/14/2017 SS7 Link Types E Links Link between an SSP and a secondary mated STP “E” stands for Extended Link F Links Link between 2 SSPs “F” stands for Fully Associated

4/14/2017 SS7 Link Types

4/14/2017 Basic Call Messages 5 Basic messages to establish a connected between 2 end points IAM Initial Address Message Requests the call/connection ACM Address Complete Message Confirms reception of IAM ANM Answer Message Confirms the route of the voice (which CICs to use) REL Release Message Requests an end to the call RLC Release Complete Message Confirms the end of the call

SS7 Signaling Stack MTP1 Physical layer DS-0 channel (56k or 64bit) 4/14/2017 SS7 Signaling Stack MTP1 Physical layer DS-0 channel (56k or 64bit) MTP2 Data Link Layer Ensures reliable transmission Error checking, flow control, and sequence checking MTP3 Network Link Layer Ensures message delivery in the network Addressing, routing, and congestion control ISUP Application Layer Protocol that establishes calls between 2 end points Call setup, call information, and call tear down

SS7 Signaling Messages 3 type of messages FISU Fill In Signal Units 4/14/2017 SS7 Signaling Messages 3 type of messages FISU Fill In Signal Units MTP2 Sequence checking, error checking, and line filler LSSU Link Status Signal Units Signaling status messages Used to “align” or “sync” two points MSU Message Signal Units MTP3 Carry all messages between points

SS7 Addressing 3 types of addresses 2 different styles of addresses 4/14/2017 SS7 Addressing 3 types of addresses 2 different styles of addresses ITU -> Decimal Number…1234 ANSI -> Network-Cluster-Member…. 1-2-3 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

4/14/2017 Thank you.

4/14/2017