[asterisk-users] DAHDI hangup detection

[Danny Nicholas]

The issue is that POTS as a technology does not have Answer/Hangup
Supervision control (This is per the good folks at Digium).  Your local
Telco may or may not be of assistance, but a simpler workaround might be to
hangup on silence or query the line through AMI before transferring to
voicemail.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Stephen Brown
Sent: Tuesday, September 15, 2009 11:18 AM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] DAHDI hangup detection

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


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