I tested the Telis 1 remote on the RFLink Gateway with R40 firmware and within one meter I get the debug output as expected:

-> Press Down
20;06;RTS;ID=e6a531;SWITCH=01;CMD=DOWN;
-> Press UP
20;08;RTS;ID=e6a531;SWITCH=01;CMD=UP;

In Domoticz when learning I also need to have the remote within 1 ...