A firewall watches incoming and outgoing network information and acts as a kind of traffic cop to halt or prevent anything that is not specifically allowed to slip through a defined defense perimeter. Typically, large corporations have dedicated firewalls that create a defense perimeter around the whole corporate network or specific network segments. These are external firewalls. If your company has an external firewall that intercepts and blocks incoming or outgoing Skype traffic, you will have to ask your network or security administrator to open the firewall to allow Skype traffic to move through the company network.
Many small companies and individuals do not have a dedicated external firewall, but instead have an internal firewall that runs in software on each individual computer. This kind of firewall sets up the defense perimeter around your computer.
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