[ICOM] 706MKII and Heil HC-5

[Brian K. Gaskamp]

Good morning all, I hope the subject it titled correctly.
I want to use my 706MKII for Field day this year and also use my Heil 
headset HC-5 with it when operating.

I need to know if I need any additional connections to make this work, or if 
its even possible.

I recall the 706MKII has a telephone type jack to use the hand mic.

What gadget will I need to purchase so that the HC-5 will work.

Thanks

73,
Brian