well here is my free (non wso advice)
You follow a script - make sure it is good....but....you LISTEN TO THE PERSON ON THE OTHER END OF THE PHONE
YOU LISTEN...AND...you quickly adapt to them
people are all unique...and if you can adapt and "mirror" them you build an instant rapport
and while unique they fall into some known patterns
example : I may call a biz owner and they are abrupt, all business, - just the facts...I am direct professional, hit the buzz words that will appeal
I call a biz who is more chatty, wants to talk , friendly ... well then so am I
relate to them...mirror them
essentially you put across the same pitch but at some point you learn to "mirror" their energy, their "outlook"....and become what they want...
the trick is to still offer the same message - just tailor it to them...you only have a short time to figure which way to go ....after awhile it gets easier.Sometimes you screw up but that teaches you.