[asterisk-users] Outgoing FXO calls have no audio with callprogress=no

[Frank Tarczynski]

My outgoing FXO calls are answered but have no audio in either direction 
if I have callprogress=no in chan_dahdi.conf.  If I change to 
callprogress=yes then the audio returns.  My chan_dahdi.conf file is 
listed below.  Can anyone point-out why callprogress=no isn't working?

#cat /tmp/a
[trunkgroups]

[channels]
language=en
context=incoming
toneduration=40
;usedistinctiveringdetection=yes
answeronpolarityswitch=yes
usecallerid=yes
cidsignalling=bell
cidstart=ring
;hidecallerid=yes
;hidecalleridname=yes
;waitfordialtone=yes
;mwimonitor=no
;mwilevel=512
;mwimonitornotify=/usr/local/bin/dahdinotify.sh
;mwisendtype=rpas,lrev
callwaiting=yes
;restrictcid=no
usecallingpres=yes
sendcalleridafter = 1
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
canpark=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
;echotraining=no
group=1
callgroup=1
pickupgroup=1
;immediate=yes
immediate=no
callerid = asreceived
useincomingcalleridondahditransfer = yes
callprogress=yes
progzone=us
faxdetect=both
;faxdetect=incoming
;faxdetect=outgoing
;faxdetect=no
faxbuffers=>6,full