[Serusers] openser & asterisk, Proxy Authentication Required problem

Hi Folks, I hope someone can help. I'm using openser 1.1.1-notls with mediaproxy, an asterisk PSTN gateway, an asterisk voicemail/features server and a trixbox (asterisk) client. I'm also very new to openser which doesn't help :) I've setup the openser database with subscribers,domains,aliases, and gateways etc. mysql> select * from dbaliases; | alias_username | alias_domain | username | domain | nnnnnn2099 | lhc-asterisk-pstn.yyy.com | lhc-trixbox1 | lhc-openser.yyy.com then I generated an openser.cfg file using the sip:wise sipwizard tool a copy is here http://pastebin.com/m46ba88d2 My asterisk PSTN gateway (nnn.nnn.nnn.190) is able to pass inbound calls to openser (nnn.nnn.nnn.189), which should then pass them onto trixbox(nnn.nnn.nnn.187). however the calls are failing. On the PSTN gateway I get the following... -- Accepting call from 'nnnnnnn1275' to 'nnnnnnn2099' on channel 0/1, span 1 -- Executing Dial("Zap/1-1", &quot;SIP/nnnnnnn2099(a)lhc-openser.isrighthere.com|30|tTr&quot;) in new stack -- Called nnnnnnn2099(a)lhc-openser.isrighthere.com Oct 26 15:22:05 NOTICE[10325]: chan_sip.c:9822 handle_response_invite: Failed to authenticate on INVITE to '"nnnnnnn1275" <sip:nnnnnnn1275@nnn.nnn.nnn.190>;tag=as37c13b61' -- SIP/lhc-openser.isrighthere.com-0074cce0 is circuit-busy == Everyone is busy/congested at this time (1:0/1/0) -- Executing Hangup("Zap/1-1", "") in new stack == Spawn extension (from-pstn, nnnnnnn2099, 2) exited non-zero on 'Zap/1-1' -- Hungup 'Zap/1-1' lhc-asterisk-pstn*CLI> in the Openser log I get the following (full log in http://pastebin.com/m46ba88d2): Oct 26 15:22:05 lhc-openser /usr/sbin/openser[24693]: route[12] Request leaving server, D-URI='' - M=INVITE RURI=sip:s@nnn.nnn.nnn.187 F=sip:nnnnnnn1275@nnn.nnn.nnn.190 T=sip:nnnnnnn2099@lhc-openser.yyy.com IP=nnn.nnn.nnn.190 ID=182fb36c7aa5a14f5d31406b63671897(a)nnn.nnn.nnn.190 Oct 26 15:22:05 lhc-openser /usr/sbin/openser[24692]: onreply_route[1] Reply - S=407 D=Proxy Authentication Required F=sip:nnnnnnn1275@nnn.nnn.nnn.190 T=sip:nnnnnnn2099@lhc-openser.yyy.com IP=nnn.nnn.nnn.187 ID=182fb36c7aa5a14f5d31406b63671897(a)nnn.nnn.nnn.190 So is this is authentication error from openser or my trixbox client? and if so whereabouts should I be looking? -Thanks in advance Max.