[Asterisk-Users] Switch polarity to disconnect a FXS channel

[Luis Czop]

Hi friends,
 
I´m trying to integrate Asterisk  with another PBX (Nortel Meridian)
 
I need to switch the polarity of a FXS port (ZAP channel) to inform the
other PBX that the channel was released.
 
Does anyone knows the way I can do it?
 
Many thanks in advance.
 
Merry Christmas to the   *   world    ! ! !.
 
Luis
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