I have a BC125AT and I have noticed when I program repeaters with the Rx CTCSS, it will mute the squelch tail, but not all the time. Sometimes it go multiple transmissions and it won't catch the reverse burst and will leave the squelch tail audible. And it does this with all repeaters using CTCSS. However, my local sheriff department repeater uses DCS and that one will mute the squelch tail every single time no matter what. I'm pretty new to this stuff so I'm not sure if this is just a problem with this Uniden model or a problem with CTCSS reverse burst in general.