When you place a call, you provide the ability to type notes within the zoho pop-up, but no way to track a call disposition (what happened on that call).  I can schedule the NEXT activity, but not what just happened.

You need ability to (within the screenpop on the bottom right) change lead status and call dispositions.

Examples.  On any given phone call, I must have

1) Left Voicemail

2) Had No contact

3) Made contact with any human

4) Made contact with Decision Maker

5) Made contact with Influencer

After completing a call, there should be a simple drop down allowing me to update what happened on THAT specific call, and also change the lead status.  That call could have progressed the sales pipeline from New, to demo scheduled, to closed (or whatever your process is).  You should be able to track that progression down to the individual call.