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:
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 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 -- - - - - - - - - - ->
