[Asterisk-Users] Polarity reversals on a TE100P

[Doug Lytle]

Hey guys,

I've been struggling with hangup detection on a Centrex system for a bit 
now, I was on site Saturday and I took my DMM with me.

It would appear that this Centrex service provider uses polarity 
reversal at the beginning of a call and several times after hangup. 

I've been reading the archives for the last year and it looks like there 
was some work done that matches my situation.  With the DMM, my readings 
are:

IDLE:      -50.5
RING:         3.0
VOICE:   -6.13
HANGUP 3.0
WAIT:      -5.13
HANGUP 3.0 (Occurs roughly every 10 seconds)
WAIT:      -5.13
HANGUP 3.0 (Occurs roughly every 10 seconds) - Asterisk times out and 
hangs up
IDLE:      -50.5

I'm using an ADIT 600 with a Tellabs Echo Canceller.  Is there any 
logging for status on the line for monitoring?

Turning on hanguponpolarityswitch=yes shows that the option is ignored.  
I've found in the archives that this works with fxs_ks.  The error goes 
away when setting a line line for KS, but it still isn't working

My zapata.conf below:

[channels]
context=incoming
signalling=fxs_ls
callprogress=no
usecallerid=no
callreturn=no
echocancel=no
echotraining=no
echocancelwhenbridged=no
rxgain=12.0
txgain=-2.5
group = 1
callerid="Outside" <(xxx) xxx-6139>
musiconhold=tape
jitterbuffers=4
hanguponpolarityswitch=yes
channel => 1


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