Dear. I have a local ACID config connected with a Motorola GM300 and URI I am using the follow cable: URI (USB Radio Interface) to Motorola Maxtrac, GM300 or M120 16 Pin Repeater I am trying to doing PTT from a Zoiper Softphone to handy device, but not works (*99), i am follow the next howto: http://allstarnode.com/viewtopic.php?f=5&t=67 But *99 not works for me. My usbradio.conf: [general] [usb] hdwtype=0 ; Leave this set to 0 for USB sound fobs modified using ; the instructions from usbfob.pdf. Use a setting of ; 1 is for Dingotel/Sph interfaces. rxboost=1 ; 0 = 20db attenuator inserted, 1= 20db attenuator removed ; Set to 1 for additonal gain if using a low-level receiver output rxctcssrelax=1 ; reduce talkoff from radios w/o CTCSS Tx HPF ; Do not change this, leave this as a 1 txctcssdefault=100.0 ; default tx ctcss freq, any frequency permitted ;rxctcssfreqs=100.0 ; rx ctcss freqs in floating point. must be in table ;txctcssfreqs=100.0 ; tx ctcss freqs, any frequency permitted carrierfrom=dsp ; no,usb,usbinvert,dsp,vox ; no - no carrier detection at all ; usb - from the COR line on the modified USB sound fob ; usbinvert - from the inverted COR line on the modified USB sound fob ; dsp - from RX noise using dsp techniques ; vox - voice activated from RX audio ctcssfrom=usb ; no,usb,dsp ; no - CTCSS decoding, system will be carrier squelch ; usb - CTCSS decoding using input from USB FOB ; (currently not supported) ; dsp - CTCSS decoding using RX audio in DSP. ; rxdemod option must be set to flat for this to work. rxdemod=flat ; input type from radio: no,speaker,flat ; no - RX audio input not used ; flat - Use RX audio from discriminator ; speaker - use de-emphasized audio txprelim=no ; Audio processing on left output channel: no,yes ; no - Audio is not pre-emphasized and limited. ; Suitable for use on a microphone input ; yes - Audio is pre-emphasized and limited. txprelim=no ; Audio processing on left output channel: no,yes ; no - Audio is not pre-emphasized and limited. ; Suitable for use on a microphone input ; yes - Audio is pre-emphasized and limited. ; Suitable for direct connection to an FM modulator txtoctype=notone ; Transmit tone control type: no,phase,notone ; no - CTCSS tone encoding with no hang time ; phase - encode CTCSS and reverse phase ; AKA ("reverse burst") before unkeying TX ; notone - encode CTCSS and stop sending tone before unkeying TX ; AKA ("chicken burst") txmixa=composite ; Left channel output: no,voice,tone,composite,auxvoice ; no - Do not output anything ; voice - output voice only ; tone - CTCSS tone only ; composite - voice and tone ; auxvoice - auxiliary voice output at headphone level for monitoring txmixb=no ; Right channel output: no,voice,tone,composite, auxvoice ; See txmixa above. invertptt=0 ; Invert PTT 0 = ground to transmit, 1 = open to transmit ; This is the collector lead of the 2n4401 on the modified ; usb sound fob. ; please refer to the howto for the procedure to do this. duplex=2 ; Full Duplex I hope you could tell me how i can do or what is the best config for usbradio.conf, URI and Motorola GM300? I hope any idea. Fernando.