How we can chcek reasons of failed calls over PGW or MGW

Dear All
We are using PGW 2200 in Signalling mode with AS5400 as MGW to terminate call over TDM/PSTN. Can anybody let me know how we can check "why attempted call failed or reason of failed call from MGW level or PGW level.
Here one thing i want to know we are not using any RADIUS server for log or billing. Please tell me how wecan chcek why & where call faield on MGW or PGW or far end operator side with reason.i chcked few document but no comnads i found to check failed reason of attempted calls..
Please help me with this info.
Thanks
Amit--. .

Hi Amit,
On the voice gateway you can use the command "show call history voice" to look for the relevant call and it will also tell you the disconnect cause/reason, and may give an indication whether the call disconnected from VoIP side or TDM side. If you don't find the call in there it means that the call didn't reach the voice gateway in the first place. Depending on the call direction this means the call dropped in the PSTN, or in the PGW, or in the rest of the VoIP network.
If you suspect the PGW, there is no quick and easy command to check why a particular call dropped. Probably the best approach in that case is to capture the problematic call in a Unix snoop trace, making sure you capture the ISUP as well as the ISDN leg of the call and then analyze the trace using Wireshark.
More advanced PGW call tracing can be done using the MML "sta-sc-trc" command, but to interprete the resulting call trace you may need the PGW expertise of a TAC engineer.
Sincerely,
Dirk Christeaens

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How we can chcek reason of failed calls over PGW or MGW

Dear All
We are using PGW 2200 in Signalling mode with AS5400 as MGW to terminate call over TDM/PSTN. Can anybody let me know how we can check "why attempted call failed or reason of failed call from MGW level or PGW level.
Here one thing i want to know we are not using any RADIUS server for log or billing. Please tell me how wecan chcek why & where call faield on MGW or PGW or far end operator side with reason.i chcked few document but no comnads i found to check failed reason of attempted calls..
Please help me with this info.
Thanks
Amit--. .

First of all you have to check C7 link state and CICs state
1. Enter to PGW host with username mgcusr
2 Run mml
3 Check active platform by command rtrv-ne
4 Check C7 link rtrv-c7lnk:all
All C7 links must be in service: IS
5 Check CIC rtrv-tc:carrier10ss7svc1
All CICs must be in Idle state
If it is so then we can go to next steps.
The best way to check reason of failed calls is to use the snooper utility.
Login as root
change directory to
/opt/CiscoMGC/bin
run utility
./snooper int bge0 ss7 itu 1-234-5 detail
Where 1-234-5 - DPC of your carrier
After that you will see a flood of ISUP messages.
In REL message you can find the reason why your call attempt was failed.
on MGW (if it is Cisco AS5xxx) you can run
debug isdn q931 command on all trunks or on selected Dchannel: debug isdn q931 interface Dchannel x/x
You will get isdn messages. In Disconnect message you can find the reason why your call attempt was failed.Good luck!

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Message was edited by: PolloTonto

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How we can chcek reasons of failed calls over PGW or MGW

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