Write CRM integration Guide

Hi All, It is very easy 15-30 minute job, You have to write "Integration guide" while elaborating that you have deep understanding of both vTiger CRM and Call Center functionality, please note that target of this guide is to get maximum benefit from vTiger and CRM Integration. Requirement: We have a predictive dialer and we want to integrate it with CRM ( probably with vTigher ), please write a guide according to following scenario and questions. Thanks 1. A predictive dialer script will import contacts from CRM before launching campaign. q1. please explain about Contact, Contact Group, and Leads in CRM q2. how to import contact / contact group / leads from CRM, please mention related APIs 2. during campaign predictive dialer will show contact information to agent, q1. Please explain CRM Campaign and how we can relate / use it with Predictive dialer campaign q2. Related API to fetch contact detail 3. after completing call / agent transfer predictive dialer will update q1. What type of data we can update in CRM q2. Is there any way to save call activity / history in CRM q3. Related APIs to update CRM contacts q4. how to change lead status. Note: more technical + informative person will win this job