Transactions have a higher closing rate if it is discussed face to face that is why Australian companies initiate a B2B appointment setting campaign. Setting up an appointment before showing up is respectful and will give the company a positive feedback.
They can create an in house team or outsource to a telemarketing company. The advantage of working with telemarketers is that they can generate leads and if the prospect is really interested, set an appointment with your sales team.
Having leads is not enough it should be qualified and warm. Working with an experienced call centre will be beneficial for your company. It is worth your investment.