[asterisk-users] hang up detection

[Matic]

Hi,

I have a small problem with tdm2400 with tone detection. About 5% of all 
calls doesn't end because Asterisk dosen't detect "busy" tone on remote 
hangup. I know that board does support current reversal and current off, 
but how do I configure asterisk to use tone detection first and if that 
should fail, current off detection which my operator support (40 sec 
after remote hang up).

Matic