asterisk users - Jan 2007 - Calls die when the answering party transfers

Dear All,

I am facing a strange problem that I can't find any matches for while
googling,  sometimes while a call initiated from asterisk to the PSTN is
answered and the answering party say the receiptionist tries to transfer
the call to someone else, the call dies, the full log shows nothing
useful and I am really unable to move forward on this issue, so can some
one suggest anything?

My zapata.conf is below also we are using Digium TDM400P with FXO
modules to connect to the PSTN.


[channels]
callerid => asreceived
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=400
rxgain=0.0
txgain=0.0
busydetect=yes
immediate=no
faxdetect=both
busycount=4
callgroup=1
pickupgroup=1
pridialplan = local
prilocaldialplan = local
nationalprefix = 1
internationalprefix = 1011
group => 0
context=from-pstn
signalling=pri_cpe
switchtype => euroisdn
language=en
channel => 1-15,17-31

signalling=fxs_ks
context=from-zaptel
group=3
channel => 63-74


signalling=fxs_ks
context=from-zaptel
group=4
channel => 75-78

--
Thx
MAG


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