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What are the causes of silent calls and what are the possible solutions?


#1

Can someone explain the causes of silent calls and possible solutions?


#2

Which vendor?


#3

Check the transmission connection


#4

The vendor is ZTE


#5

In case if it is one site


#6

More than one site and it happens intermittently


#7

On Zte its very rare you get mute call. If it is you can check packet loss, any issue of transmission.


#8

Most probably transmission issues


#9

Can transmission issues like high BER cause it?


#10

Yes, they can


#11

Or faulty stm


#12

And on what scenarios these happens?


#13

At times one way at times 2 way


#14

is this GSM?


#15

Yes it is GSM


#16

Are those mute calls made within the home network or are made inter-network?


#17

I think yon need to check is the AMR codec mode sets are aligned.
It is also possible that there is some problem on MGW side, so ask CN guys to help investigate this issue.