Some of those important factors are:
If a business wants to target other industries for their telemarketing campaign then the firm should have already amassed an adequate amount of experience. This is to assure business owners that they are highly capable in meeting expectations for the campaign.
Feedback rating Telemarketing firms should have a feedback rating that points in the positive direction. This is to ensure of a business' name to be kept intact once they take advantage of the firm's services.
Telemarketer's attitude towards work
The telemarketers working for the firm should always have a positive outlook towards their work. If they have this, every good thing will fall into place which includes having profitable results for the campaign.