W60h Headset Call Control

[Lansalot]

Hello
I am reselling Yealink phones to our customers, and one question has come up.

With the 3.5mm headset port on the W56h Handset, is there any call-control? i.e. pickup call / Hangup call? I have seen wired headsets come with older mobile/cell phones which have call control on the wire, e.g. Apple Iphones used to come with them, Samsung Galaxy used to come with them - both use a 4-pole 3.5mm jack plug for this purpose.

Is there any tested/compatability list for headsets related to the W56h Handset?

Same questions for W52h, on the 2.5mm connector.

Thanks
Jon

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Sorry just found this thread which is a similar question actually, so I think I put my question in the wrong place:
http://forum.yealink.com/forum/showthread.php?tid=41591

However it does not mention call control, even on the Yealink FAQ: http://support.yealink.com/faq/faqInfo?id=319

So part of my question is answered - but is there any call-control support?

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Also found this which is quite interesting / useful, in relation to CTIA (aka AHJ) - for anyone else looking:
https://help.longtailproducts.com/hc/en-...-CTIA-OMTP