I think he is referring to the SMS option or lack of.
I've tested your skin and use it and I don't see any problems with Phoco 1.5
The problems are with Phoco 1.6b/RR and some remote options and that is depending on the phone being used. The phoco preset option (phoco.pst) might need to be added on the mixer skin so as to allow users to set that for an, in call progress volume setting.
The headphone indicator is an option to add.