[asterisk-users] rxfax detection problems with multiple contexts

[Mayo Jordanov]

Hello,

I have a rather odd problem with Asterisk detecting faxes. I have two  
POTS lines coming into the box (TDM400P). Line 1 is for voice, Line 2  
is fof fax. When I set them up with channel => 1-2 in zapata.conf,  
all is fine, but as soon as I have two channel => definitions,  
Asterisk is unable to detect faxes. The fax line is not supposed to  
ring local phones, so the most obvious solution was to try and split  
the contexts. The configuration below is my current setup that works  
almost flawlessly. The bits that aren't working are pretty annoyances  
that result from using single context for both lines.

With the setup the way I want it, last two lines of channel 1  
configuration and whole channel 2 configuration in zapata.conf would  
be uncommented and there would be no fax detection in from-analog-zap  
context - as per the comments in the config. As it is now, from- 
analog-zap2 may not be giving enough time for fax detection, but I've  
tried variations. Generally, all it will do is keep on ringing and  
ringing and not detecting the fax tone. I've tried turning off echo  
cancelation and few other things with no luck.

Is this possible bug in chan_zap or something related? Is there any  
way I can debug more? From just looking at the console it looks like  
a regular incoming call that keeps ringing and falling though. Any  
ideas or recommendations?

Thanks,
mayo



The setup is as follows:

zapata.conf:
[channels]
language=en
switchtype=national
signalling=fxs_ks
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
canpark=yes
cancallforward=yes
callreturn=yes
echocancelwhenbridged=no
echocancel=64
echotraining=800
callgroup=1  ; i do not use call groups, left it in as it's default
pickupgroup=1
rxgain=0
txgain=0
group=1
immediate=no
context=from-analog-zap1
faxdetect=both ; normally would be: none
channel => 1-2 ; normaly would be: 1

;channel 2 ; normally would be uncommented
;echocancelwhenbridged=no
;echocancel=64
;echotraining=800
;rxgain=0
;txgain=0
;context=from-analog-zap2
;faxdetect=both
;immediate=no
;group=1
;usecallerid=no
;signalling=fxs_ks
;channel => 2

Both channels are in group 1 on purpose, as both lines may be used  
for outgoing calls.

extensions.conf:
[from-analog-zap1]
include => incoming

; normally this wouldn't be here if zapata.conf worked as intended.  
this bit would get handled by from-analog-zap2
exten => fax,1,GotoIf($["${CHANNEL}" != "Zap/2-1"]?4)
exten => fax,2,Set(FAXFILE=/var/spool/asterisk-fax/${UNIQUEID}.tif)
exten => fax,3,rxfax(${FAXFILE})
exten => fax,4,Hangup


[from-analog-zap2]
exten => s,1,Answer
exten => s,n,LookupCIDName
exten => s,n,NoOp(CallerID: ${CALLERID})
exten => s,n,Hangup

exten => fax,1,Set(FAXFILE=/var/spool/asterisk-fax/${UNIQUEID}.tif)
exten => fax,n,rxfax(${FAXFILE})
exten => fax,n,Hangup

exten => i,1,Hangup
exten => h,1,Hangup

[incoming]
include => parkedcalls

exten => s,1,Answer
exten => s,n(zapateller),Zapateller(nocallerid)
exten => s,n,LookupCIDName
exten => s,n,NoOp(CallerID: ${CALLERID})
exten => s,n(ring),Dial(SIP/2000&SIP/2001&SIP/2002,30)
exten => s,n,Voicemail(u2999)
exten => s,n,Hangup
exten => s,n(ring)+101,Voicemail(b2999)
exten => s,n,Hangup

exten => i,1,Hangup
exten => h,1,Hangup