What is the difference between reverse patch and control patch?
As described above, a reverse patch is where a user calls the repeater to make a contact on the repeater via the phone lines. A control patch is where a sysop calls the repeater to issue control commands. The responses to the control patch are filtered from the repeater output so that there is no indication that there is a person issuing control commands. The only evidence to a control patch is that the DTMF decoder is switched to the phone line and DTMF commands entered at the repeater input will not be recognized.