I'm stumped, I am trying to get an XPR 7550E and an Sl300 to talk to each other. Both are on the same frequency, same talk group, color code is 0 on both and same time slot. I've tried with an Anytone 878, the Anytone and XPR will talk but the Anytone in digi monitor will not hear the SL. Both can be heard on a Uniden scanner. Any help is appreciated.