Using a receive on time delay, (/etc/asterisk/usbradio.conf - rxondelay=20), to prevent a keying loop between the two nodes goes something like this: 1. User w7abc keys up repeater 'A' and node 28174 receives the signal and sends it out the VoIP gateway to the Internet to node 28210 which then transmits what it receives from VoIP and repeater 'B' keys up and is now linked. 2. W7ABC finishes the conversation, repeater 'A' stops transmitting, node 28174 stops receiving and the audio to the VoIP gateway is closed. Node 28210 does not receive audio from VoIP and so it stops transmitting, and repeater 'B' stops transmitting and the link is down. 3. Repeater 'B' does not stop transmitting instantly when node 28210 stops transmitting, it has a hang time of approximately 1.6 seconds. Node 28210 will receive this signal as soon as it stops transmitting and send that audio out the VoIP Gateway to node 28174 which will then transmit and key up repeater 'A'. 4. This causes a "keying loop" between nodes 28210 and node 28174. 5. There is a variable called "rxondelay" in /etc/asterisk/usbradio.conf that controls when the node receiver can send what it receives out the VoIP gateway. I would expect that if 'rxondelay=90' which is approximately 1.8 seconds, that this delay would account for the hang time of repeater 'B', but it is insufficient. Through trial and error I have found that 'rxondelay=200', or 4 seconds, is required to prevent a single keying loop. 6. A 'rxondelay=90' is sufficient to prevent an ongoing keying loop that does not end, but it is not sufficient to prevent a keyup of node 28174 "one time". 7. Node 28174 uses a 'rxondelay=60' to account for the repeater 'A' hang time. So this is a mystery that I have not solved. A 4 second receive on delay for the link over VoIP is a long time for the repeater users to work with. Many replies and short conversations take less time. This method of linking is not a real good one, but it is a portable solution for quick linking repeaters. Is there something I am missing in the configurations that would shorten the link timing? Ron KA7U