Just to give you a look at the business end of Unified Communications, this post will help you appreciate the benfefits of being or utilizing a Telecom Broker/Agent. You can buy direct from a sales agent at a specific carrier, but there are no benefits for you or your business by going that route. The benefits for the sales agents are limited as well.
The Telecom Broker receives benefits by working with you and for you in a reciprocal fashion- they don’t benefit unless you do. Whether you are seeking a Telecom Broker to assist you with the communication infrastructure within your business or you’d like to diversify your own income by becoming a Broker/Agent, you’ve arrived at the right place. 
- Build and maintain relationships with businesses
- Gain and utilize your experience.
- Apply your knowledge and creative problem-solving skills to help businesses.
- Choose from and have access to several carriers’ products and packages to help businesses save money.
- Stay informed and current on new technology within the industry.
Suggested Reading: https://nwmap.com/questions-to-ask-when-choosing-a-telecom-agency
https://nwmap.com/clients-versus-sales
https://nwmap.com/get-more-for-your-money-by-using-a-telecom-broker
