Please tell me the obvious mistake I'm making here. (And yes, I well know about NAT and one-way audio problems in general.) I want to try the new T.38 passthrough stuff, downloaded it, built it, tested it with an SPA-2100 and can hear announcements fine but echo test shows no audio outbound (i.e. SPA to Asterisk). Registered the second SPA-2100 channel with an Asterisk 1.0.10 server in the same rack (IP address differs by 1) and it works fine (which suggests no problem with the NAT router the SPA-2100 is behind). Here are the various SVN checkouts I did (all have the problem -- if you can't guess I'm no SVN guru -- SCCS was the last version control system I mastered). svn checkout http://svn.digium.com/svn/asterisk/team/oej/t38passthrough asterisk svn checkout http://svn.digium.com/svn/asterisk/trunk asterisk svn checkout http://svn.digium.com/svn/asterisk/branches/1.2 asterisk-1.2 Here is the sip.conf entry: [t38.nvc.a] type=friend context=t38-inbound callerid=John Doe <1234> host=dynamic secret=xxyyzz qualify=2000 nat=yes accountcode=NVC06 type=friend dtmfmode=rfc2833 canreinvite=no What else do you need? Where do I look? I'm assuming the problem is either in the manner I'm checking out the code or in some 1.2-specific config thing I'm overlooking (the missing no-one-way-audio option in sip.conf?) -- George Pajari, netVOICE communications 604 484 VOIP (484 8647 x102) Open Source VoIP/Telephony Specialists 1 877 NET VOIP (638 8647 x102) www.netvoice.ca www.ip-centrex.ca www.digium.ca www.grandstream.ca www.sipura.ca www.snom.ca