Hi, I am a software engineer. Needed to simulate Amature Radio over VOIP. Below are my inquiries. My understanding of app_rpt, is Links Base Nodes, with other Base Nodes, with VOIP. Links Repeaters with Base Nodes, VOIP. I am not a hardware engineer, ok, so the repeater to Linux interface might need some hardware. So app_rpt manages that??? Same is for Base Nodes??? What is my problem here? I have to build a system where users communicate through their microphone head set, to the other receivers/transmitters (also on the computer), like emulating an Amateur Radio environment, through VOIP. Different users on different frequencies, all communicating with each other, Linked through a server like Asterisk. A typical VOIP conference call, though we have to provide frequencies like Amateur radio. Now the above problem can be done with Asterisk. But since app_rpt is for specially Amateur Radio environments, how can I use the functionality provided by app_rpt. app_rpt links the Base Nodes/Repeaters would it be useful as a server for managing users at their frequencies communicating, adding it's extra capability of linking nodes. I don't need the hardware support from this module, as I am using just a microphone head set. Any replies will be greatly appreciated. I have already been through a lot of research to reach to Asterisk first, then a client, then app_rpt. And the app_rpt site is very hardcore technical stuff. -- Regards, Babar Abbas.