Continuity Testing Call Flow (CCR/COT)

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Continuity tests are used to make sure that the SS7 ISUP interface circuit groups (CIC) are aligned with the physical links (E1/T1) properly. Toolpack version 2.7 allows users of the TMG to do ISUP Continuity Testing via 3 methods by CIC Group or individual CIC:

Contents

Incoming Continuity testing outside a call

This circuit testing occurs when one of the nodes wants to validate a currently idle circuit. It is recommended that the switch first blocks the circuit to prevent calls to use the circuit during the testing. A successful COT Test Callflow is as below: For ITU: 

Peer SP                                        TMG
CCR            - - - - - - - - - - -> 
Check tone     - - - - - - - - - - -|
                - - - - - - - - - -
REL            - - - - - - - - - - ->
               < -- - - - - - - - - -          RLC

For ANSI: 

Peer SP                                        TMG
CCR            - - - - - - - - - - -> 
               < -- - - - - - - - - -          LPA
Check tone     - - - - - - - - - - -|
                - - - - - - - - - -
REL            - - - - - - - - - - ->
               < -- - - - - - - - - -          RLC

Incoming Continuity testing within a call

This circuit testing occurs when the forward side (originating side) sets the ‘continuity test required’ field of the ‘nature of connection indicators’ IE into the IAM message. A successful COT Test Callflow is as below: 

Peer SP                                        TMG
IAM           - - - - - - - - - - ->
Check tone    - - - - - - - - - - -|
              - - - - - - - - - - -
COT (successful) - - - - - - - - -->
             <- - - - - - - - - - -            ACM
              - - - - - - - - - - -            Ringing tone
             <- - - - - - - - - - -            ANM
Connectivity - -  - -  - -  - -  - -           Connectivity
REL          - - - - - - - - - - ->
             <- - - - - - - - - - - RLC

Outgoing COT testing

Users of the TMG unit can generate out of call SS7 ISUP Continuity Tests via webportal easily. A successful COT Test Callflow is as below: 

Peer SP                                        TMG
            < - - - - - - - - - - -            CCR
            |- - - - - - - - - - -             Check tone
              - - - - - - - - - -
            < - - - - - - - - - - -            REL 
RLC          -- - - - - - - - - - ->

Configuration

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