someone call me on Skype:

• If you already know the person's contact information, follow these steps: From your Contacts button list, find the person you wish to call. Choose the person you wish to call, then press the audible audio call button.
• If the person has more than one phone number saved, you can choose from a drop-down list which one you want to call.
• Simply add another participant to a one-on-one chat or pick the Start call button in a group chat to make a group call.
• To hang up, select the end call button at the end of a call.

Read More: How does Skype work technically?