[asterisk-users] Problem with busydetect and cell phones

[Ryan McDaniel]

>I have a very strange problem I'm hoping someone has encountered
already.
>I've scoured the internet for an answer to this one.  My phone company
>provides no disconnect supervision.  Hence I'm forced to use the
busydetect
>feature.  I have a TDM400 with two FXO ports.  If I call from an
internal
>extension to a landline and then hangup the landline Asterisk detects
the
>busy signal correctly and clears the line.  If I call from an internal
>extension to a cell phone and then hangup the cell phone Asterisk will 
>never
>detect the busy signal though it is clearly there.  Asterisk will
happily
>sit there listening to the busy signal.  I suspect that the busy signal
>styles are slightly different though it is undetectable to me.  How can
I
>fix this???  It causes severe issues when a call is forwarded to a cell
>phone via the Zap interfaces as once you hangup the cell phone Asterisk
>never releases the channel.
>

The landlines are with AT&T.  The cell phones I'm testing with are
Cingular (AT&T subsidiary).  There must be a subtle difference in the
busy signals.  How can I make it catch busy signals from both carriers?

>zaptel.conf
>loadzone=us
>defaultzone=us
>
>zapata.conf
>[channels]
>language=en
>
>; include zap extensions defined in AMP
>#include zapata_additional.conf
>
>; TDM Port #3,4 plugged into PSTN
>;AMPLABEL:Zap Channel %c
>context=from-zaptel
>signalling=fxs_ks
>usecallerid=yes
>hidecallerid=no
>callwaiting=yes
>callwaitingcallerid=yes
>threewaycalling=yes
>transfer=yes
>canpark=yes
>cancallforward=yes
>callreturn=yes
>echocancel=yes
>echocancelwhenbridged=no
>echotraining=yes
>rxgain=0.0
>txgain=0.0
>immediate=no
>busydetect=yes
>busycount=4
>;busypattern=500,500
>;answeronpolarityswitch=yes
>;hanguponpolarityswitch=yes
>;callprogress=yes
>;progzone=us
>channel => 3-4