Looking at the pic
Line- would be Tel R-
Yellow Mute would be Tel Mute
Line+ would be Tel R+
Parrots are just messy for integration - youd have to unplug both ISO adapters from that quadlock loom and just use those three on the new connector i mentioned above
Redev- on yours, they have connected the mute, but left the audio going through the ISO blocks rather than via the HU on the proper terminals