Continuity Testing Call Flow (CCR/COT)

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:

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 test call flow is as below:

For ITU:

Peer SP                                        TMG

CCR            --------------------->          

Check tone     ---------------------|         (timeslot loopbak)    
                -------------------

REL            --------------------->

               <---------------------          RLC

For ANSI:

Peer SP                                        TMG

CCR            ---------------------> 

               <---------------------          LPA

Check tone     ---------------------|         (timeslot loopbak)     
                -------------------

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 test call flow is as below:

Peer SP                                        TMG

IAM           --------------------->

Check tone    ---------------------|          (timeslot loopbak)  
              ---------------------

COT (successful)------------------->

             <---------------------            ACM
 
             ---------------------             Ringing tone

             <---------------------            ANM

Connectivity ---------------------             Connectivity

REL          --------------------->

             <---------------------            RLC

Outgoing Continuity Testing

Users of the TMG unit can generate out of call SS7 ISUP Continuity Tests via webportal easily.

A successful test call flow is as below:

Peer SP                                        TMG
            < ---------------------            CCR

            |---------------------             Check tone
              ------------------

            < ---------------------            REL 

RLC          ---------------------->    

Configuration

• Web Portal v2.7: Outgoing Continuity Testing