[asterisk-users] DAHDI hangup detection

[Stephen Brown]

I am running Asterisk 1.6.1.6 and DAHDI/DAHDI tools 2.2.0.2 compiled 
from source on a Debian Lenny box, also running FreePBX 2.5.2. I also 
have an OpenVOX TDM400 card installed with an FXO port on port 1, and an 
FXS port on port 2. I have a POTS line installed and working on the FXO 
port.

However I've encountered a weird problem that I can't seem to figure 
out. I have incoming POTS line calls set to ring a SIP extension (a 
cisco IP phone). It works, but here is the issue:

- If an inbound call comes in on the POTS line and hangs up before the 
call hits voicemail or during the voicemail greeting, Asterisk does not 
appear to detect this condition.
- As a result of this, a voicemail is being left with a dialtone and 
notifying me

As a workaround, I have set busy detection in chan_dahdi.conf and set 12 
seconds for a minimum voicemail message in voicemail.conf, but I must be 
missing something or something is potentially broke. While this 
workaround works, I don't suspect this behavior I am experiencing is 
normal and I am having a hard time putting a finger on it.

Thanks for any replies.

Stephen