chart

Q: From your Namaaz chart (http://muftionline.co.za/node/11013) I have seen that there are total 15 rakaats in Esha salah. But I have heard that there are total 17 rakaats in Esha salah i.e. 4 sunnah, 4 fard, 2 sunnah muakadah, 2 nafl, 3 witr and 2 nafl. Please clarify.

Q:

1. How many total rakats do we have to pray in the five daily Salah including fard, sunnat, nafil, etc. according to the Hanafi madhab?

2. Is it obligatory to pray three rakats witr in Isha Salah?