asterisk users - Feb 2005 - Bristuff - analogue communication over ISDN

Hello,

I have * config with one quadBRI card for PSTN ISDN lines and one
TDM400P for analogue faxes and modems. I could never get a fax or modem
to work reliably over ISDN. With bristuff 0.2.0 RC3a (* 1.0.3) modem
connection would drop after a few secs, and fax would never get through
if it had more than two pages. Then I upgraded to bristuff 0.2.0 RC6 (*
1.0.5) and things got better, but hardly satisfactory. Modem connection
holds up to 15 min, and faxes go through although output is sometimes
garbled.

I would appreciate any pointer on how to begin resolving this issue. I
realize that the best advice is to get rid of analogue technology
alltogether, but unfortunately that is currently not an option.

My zaptel.conf and zapata.conf are attached.

Niksa
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[trunkgroups]

[channels]
language=en

callwaiting=yes
callwaitingcallerid=no
threewaycalling=yes
transfer=yes
cancallforward=yes

usecallerid=yes
hidecallerid=no
useincomingcalleridonzaptransfer=yes

relaxdtmf=no
echotraining=no
echocancel=no
echocancelwhenbridged=no

rxgain=0.0
txgain=0.0

callgroup=0
pickupgroup=0

context=from-tcom
switchtype=euroisdn
pridialplan=local
prilocaldialplan=local
overlapdial=yes
immediate=no

signalling=bri_cpe

group=1
channel => 1,2,4,5

context=from-mobile
group=2
channel => 7,8

context=international
signalling=bri_net_ptmp

callreturn=yes
callerid="Servis ISDN" <36>
group=3
channel => 10,11

signalling=fxo_ks

busydetect=yes
busycount=4

callerid="Fax modem" <22>
group=4
channel => 13

callerid="Servis analog" <24>
group=5
channel => 14

callerid="Dragan modem" <26>
group=6
channel => 15

callerid="Fax" <27>
group=7
channel => 16

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span=1,1,3,ccs,ami
span=2,2,3,ccs,ami
span=3,0,3,ccs,ami
span=4,0,3,ccs,ami

bchan=1-2
dchan=3
bchan=4-5
dchan=6
bchan=7-8
dchan=9
bchan=10-11
dchan=12

fxoks=13
fxoks=14
fxoks=15
fxoks=16

loadzone=nl
defaultzone=nl