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handset key pressed if I press 9 to start with. However, if I press with 6,
it is ok.

On the other hand, if DMTF key is generated from softphone, it is ok.

My dialplan is as follow

exten => 1002,1,Answer
exten => 1002,n,Wait(2)
exten => 1002,n,Background(thank-you-for-calling)
exten => 1002,n,Background(vm-enter-num-to-call)
exten => 1002,n,WaitExten()
exten => 1002,n,Hangup
exten => i,1,Background(pbx-invalid)
exten => i,2,Goto(1002,1)
exten => t,1,Background(vm-goodbye)
exten => t,2,Hangup

Thanks for the help in advance.

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