Dear colleagues, I built a node configuration with ACID system and URI from DMKEngineering. After the import of the ACID/Asterisk/app_rpt configuration from Allstarlink.org I connected the URI to my reg and install IAX client to the PC. The system work well from IAX clent through URI to the reg - when I send audio or voice from IAX client to the reg through URI the reg transmit the audio very well and clear. The problem is that I can not send any audio signal from the REG to the IAX client. Practically the audio from the REG go to the MIC_AC pin of URI and after that dropped down. Practically I have only one way audio communication: Iax client ->Asterisk-> app_rpt -> URI -> reg Probably I use a wrong usbradio.conf configuration but have not idea where to start looking for the problem. I red in the mailing list content some similar cases and advices about URI MIC interface problems and tried to use them but unfortunately without success. I will be very grateful for any advice how to resolve the problem. 73! Alex LZ1AZA The configuration I use is the following: URI hardware interface: audio line output of the reg - to URI MIC_AC (pin 21) microphone input of the REG - to LEFT_AC(pin 22) PTT - to PTT pin of the URI (pin1) the URI's usbradio.conf file look like this: ; ; Usbradio channel driver Configuration File ; [general] [usb27371] hdwtype=0 rxboost=1 txboost=1 rxctcssrelax=1 txctcssdefault=100.0 rxctcssfreqs=100.0 txctcssfreqs=100.0 ;rxctcssoverride=0 carrierfrom=dsp ctcssfrom=dsp rxdemod=flat txprelim=yes txlimonly=no txtoctype=notone txmixa=composite txmixb=no invertptt=0 duplex=1 rxondelay=0 rxnoisefiltype=0 eeprom=0 #includeifexists custom/usbradio.conf