Well, after a few thoughts, I remembered my iPhone's headphones were still in their box, so I sacrificed them :
by curiosity I cut the Apple monitors in half, the cable makes a knot inside it, so I cut the cable a little before to get a not twisted cable end
dismounted the Phonak monitors :
- the silver part is glued on the black body, I found no way other than lifting it and breaking it in parts
- two screws maintain the two plastic parts of the body
- carefuly opened the body, removed the system (sorry my poor english, I'm french)
- took a photo of each monitor to remember which cable (signal and ground) is soldered to what contact point
- removed the original cables with my soldering iron
preparation of the iPhone cable :
- sliding the rubber part of the Phonak monitor on the iPhone cables
- cuting the white rubber tubing to let enough copper cable
soldering the new cable on the monitors
- putting a small drop of solder on each contact of the monitors
- soldered the cables
put everything back
- placing the monitor system in the black body and the cable in its place with the black rubber end of the Phonak monitors
- closing the body parts and screwing them
plugged on my computer, the sound is back and always great !
with remote-mic addition, the microphone a bit close to my ear