Access Web System from external

Take Equity Collection System as an example, Some other office collegues want to access it from home without VPN, The way to check is:
1.  Check if it's limited in network, this needs to confirm with network people
2.  If the step 1 passed, get the external IP address of the system, map the system to the domain name, such as Edgar.**.com. Then the domain should can be access from external.