now I can able to access to ATA 192. I already configured to CUCM side as like Third Party, but I don't understand the ATA SIP Configuration.

it has been configured as you said but it could not be able to register to CUCM. I also tried with Ekiga software and then it is registered successfully. Does ATA192 has a configuration web page like as other Third Party Sip Devices ?

Hi George, I just checked to CUCM but it seems the ata 192 is not on the list. the System version: 11.5.1.16900-16.