Before doing this, you need more information.
You need to find out if it is legal in your location place cold calls, and the way in which the calls need to be placed in order to make them legal if there are regulations.
In the US, where I live, it is legal as long as I am manually dialing each number and am not calling a cell phone or someone who has put their number onto the federal "do not cal list." It is illegal to call a cell phone even if you are manually dialing the number or if they have put their number onto that list. So I have a lot of work to do before I pick up the phone. Setting up a computer with a recorded message and putting it to work calling all the numbers in a block, which was legal 20 years ago, is now against the law in most places here. Your local and federal laws will give guidance.
Even so, there are people and companies that do this practice in the US. Most people do not like to get a cold call, a very few will know if it is legal or not, and will take action against if it is illegal. I have a friend who makes a portion of his living by suing people and companies that violate the phone call laws here in the USA. The statutory mandated awards for violation are pretty high.
In short, I do not think that this is a good idea and you better have the resources to pay a court award or defend yourself against people who will sue you if you do it.
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Before doing this, you need more information.
You need to find out if it is legal in your location place cold calls, and the way in which the calls need to be placed in order to make them legal if there are regulations.
In the US, where I live, it is legal as long as I am manually dialing each number and am not calling a cell phone or someone who has put their number onto the federal "do not cal list." It is illegal to call a cell phone even if you are manually dialing
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