No, that is just a tone. Correct disconnect supervision is an electrical thing. Either reversing the polarity or dropping battery.

Mochamad Susantok wrote:
I am don't sure what PBX we have, but when i hangup i hear like " tut tut
tut " in the other side, Is that not "disconnected signal" ?

FYI when i take call from PBX to VoIP client or vice versa. it's ok. What
do you think, are there is have some relation with my problem ?

What PBX do you have connected to the Asterisk servers? My experience is
that most PBXs do not provide a disconnect signal on their analog station
ports. I have had the most success with disconnects on Avaya PBXs. Nortel
analog stations last I tested with any, did not provide a disconnect
signal. On these other PBXs you will need to use "band-aids" like having
zaptel monitor for busy or dial tone when the analog station hangs up.
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