Hi, I'm trying to set up faxing (with hylafax) and am having trouble getting it to send or receive over DAHDI trunks (openvox a400p fxo). Incoming: Fax detection is working (both 'zaptel' and NVfax), the call is sent to the IAX fax extension, and you can hear the start of the 'handshake' on the fax machine side. Then, as soon as the first few fax tones finish the call is dropped and the physical fax machine says "Comm Error". Outgoing: The fax machine rings, picks up the call, and again you can hear the handshake start. Then the call is dropped and the fax machine says "Comm Error". The message in the Hylafax log is Code: ERR No carrier detected The strange thing is I can send out over a SIP trunk (by changing the outbound route only) and it works. So clearly its got something to do with the DAHDI side of things. I have installed AvantFAX using the script on these forums and it made no difference. I am currently running 1.5RC4. Here is my chan_dahdi.conf Code: [trunkgroups] [channels] context=from-pstn signalling=fxs_ks rxwink=300 ; Atlas seems to use long (250ms) winks usecallerid=yes hidecallerid=no callwaiting=yes usecallingpres=yes callwaitingcallerid=yes threewaycalling=yes transfer=yes canpark=yes cancallforward=yes callreturn=yes echocancel=yes echocancelwhenbridged=no faxdetect=incoming echotraining=800 rxgain=2.0 txgain=1.0 callgroup=1 pickupgroup=1 ;Uncomment these lines if you have problems with the disconection of your analog lines busydetect=yes busycount=3 immediate=no #include dahdi-channels.conf #include chan_dahdi_additional.conf Thanks in advance for any info.