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international call sometime cannot establish via AT0 trunk

Publication Date:  2019-03-28 Views:  71 Downloads:  0
Issue Description

We have issue on U1960 , whenever we are trying to call international it’s taking beep sound and disconnect, some time the call will go after long waiting.

the using trunk is analogy . 

Alarm Information

It’s taking beep sound and disconnect. after checking call logs it show temporary fault .

Handling Process

1- we get the version of u1960  which is V200R003C30 and the toplogy was single site node 

2- we check the configuration of At0 trunk " it was fine " .

3- we asked to check the ground of  u1960 and be sure the voltage between gorund line and zero line less than 4 


    customer feedback ground is match requirment 

4- we ask customer to provide us with call logs and mention the caller , called numbers and the time which he make the test .


Root Cause
issue is from service provider which provide customer with AT0 trunk 
Solution

1- customer provide us with call logs , please found result as below : 

For this call end because U19 send 480 error 


 

And then check the reason we send 480 ,we found it’s because the AT0 trunk already send the release message to us ,so it’s also not problem in our side this time,


so we advise the customer to contact service provider to check At0 trunk from their side and it found it not suitable  then issue is solved 

END