Presales is a process or a set of activities/sales normally carried out before a customer is acquired, though sometimes presales also extends into the period the product or service is delivered to the customer

Sales telecalling requires you to use the phone to obtain sales; your goal is to obtain agreement from an existing client or prospect over the phone.

Data Mine 
As per your industies and demographic you can opt data from online sources .

The time of day that you place a sales call can affect whether you obtain or lose the sale.
Your voice is your most critical selling tool in telesales; use it to your advantage. Although you are speaking over the phone, the receiver can detect your demeanor through your voice.

You have only a few seconds to establish a rapport with a prospective client. Remember, he doesn't know you and will likely be on guard when he receives your call. Your goal is to break down those walls and pave a trustworthy and mutually beneficial relationship.

Create Deal Use

Follow Up
Once you have landed the sale, it can be tempting to forget about it and pursue the next client or prospect. 

Use an audio recorder to tape your delivery. Play it back so you can hear yourself. Make sure that you are naturally pausing during your delivery, that your volume is calm and low but not too soft, and that your breathing is well paced.