GMRS repeaters, unlike HAM repeaters are *NOT* required to ID by FCC law FYI. Many do out of courtesy but some don't. For example my Crete system is linked to the Midwest network and I don't have it ID'ing. *Most*, if not all, repeaters have this function standard and will ID based on whatever parameters are set. For example on my Rugged machine I have it set to *NOT* ID unless it's been keyed. So for example if it sits for 3 hours with no one keying it, it's not going to be ID'ing every 15 min like some HAM systems I hear (Terribly annoying). Then say someone uses it or keys it, it will wait 5 seconds for inactivity and then ID. Say someone keys it in the middle of ID'ing it will stop ID'ing and let the conversation take place. Once it's dormant for 5 seconds it will attempt to ID again. Once it fully ID's the 15 min timer starts and the process starts over. I also have it set to ID in the clear without any PL/DPL tones as having it ID with the tone is the worst cuz then all your users can hear the Morse code which is dumb. There are some repeaters that ID with the PL and I cannot stand that! There is *ZERO* reason to do it this way because if you want to hear the ID just open your squelch on your radio. When you have a receive PL/DPL set on the radio and the repeater is ID'ing in clear, your radio will receive the signal and the RX light will be (in my case) green but no annoying Morse code would be heard unless you open the squelch.
Hope this adds some more clarity from the repeater side of, in my opinion, correct repeater CW ID setup.