I'm using Asterisk 1.09 with bristuff 0.2.0-RC8n, one BRI line and a Sipura SPA-2000. I have a HP LaserJet 3330mfp all-in-one. I can receive faxes but not send them. The faxes start whistling to each other but the transmission is stopped with a "communication error" To receive a fax I have this in my dialplan: exten => 0000000000,1,Ringing exten => 0000000000,2,zapEC(off) ; disable EC on the incoming channel exten => 0000000000,3,SetCIDNum(${PRI_NETWORK_CID}) exten => 0000000000,4,LookupCIDName exten => 0000000000,5,Dial(${FAX}) To send a fax I use these options: exten => _9.,1,Dial(ZAP/g1md/${EXTEN:1},70,rdT) exten => _9.,2,Macro(fastbusy) I'm puzzled why I can receive faxes but not send them. The HP is capable of 14k4 transmission speeds (and I think even higher) but why wouldn't that be a show stopper to receive faxes? In the firmware of the HP I cannot discover an option to limit the tx/rx speed. Any hints on what I am doing wrong greatly appreciated. Is there another way to force the faxes to try 9k6 as the max speed or does my dialplan have mistakes? Thanks!!