[Asterisk-Users] TDM400 doesn't know the hangup signal in china

[lanfei chen]

Hi guys,
   I have a TDM400 with 4 fxo ports installed in my
IPPBX box. When I call in my IPPBX through this card
and after it answers I hangup, IPPBX still keeps going
to timeout. It cannot recognize the hangup signal from

PSTN. 

Anyone knows the solution. 
Thank you so much.

jintwo

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