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.
Mike
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